Template:Short description {{#invoke:other uses|otheruses}} Template:Shortlead Template:Infobox mineral
Garnets (Template:IPAc-en) are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives.
Garnet minerals, while sharing similar physical and crystallographic properties, exhibit a wide range of chemical compositions, defining distinct species. These species fall into two primary solid solution series: the pyralspite series (pyrope, almandine, spessartine), with the general formula [Mg,Fe,Mn]3Al2(SiO4)3; and the ugrandite series (uvarovite, grossular, andradite), with the general formula Ca3[Cr,Al,Fe]2(SiO4)3. Notable varieties of grossular include hessonite and tsavorite.
EtymologyEdit
The word garnet comes from the 14th-century Middle English word gernet, meaning 'dark red'. It is borrowed from Old French grenate from Latin granatus, from granum ('grain, seed').<ref name="Klein-1993">Template:Cite book</ref> This is possibly a reference to mela granatum or even pomum granatum ('pomegranate',<ref>pomegranate. Online Etymology Dictionary. Retrieved on 2011-12-25.</ref> Punica granatum), a plant whose fruits contain abundant and vivid red seed covers (arils), which are similar in shape, size, and color to some garnet crystals.<ref>garnet. Online Etymology Dictionary. Retrieved on 2011-12-25.</ref> Hessonite garnet is also named 'gomed' in Indian literature and is one of the nine jewels in Vedic astrology that comprise the Navaratna.<ref>Template:Cite book</ref>
Physical propertiesEdit
PropertiesEdit
Garnet species are found in every colour, with reddish shades most common. Blue garnets are the rarest and were first reported in the 1990s.Template:Sfn<ref>Template:Cite journal</ref><ref name="blue"/><ref>Template:Cite journal</ref>
Garnet species' light transmission properties can range from the gemstone-quality transparent specimens to the opaque varieties used for industrial purposes as abrasives. The mineral's lustre is categorized as vitreous (glass-like) or resinous (amber-like).<ref name="Klein-1993"/>
Crystal structureEdit
Garnets are nesosilicates having the general formula X3Y2(Template:Chem)3. The X site is usually occupied by divalent cations (Ca, Mg, Fe, Mn)2+ and the Y site by trivalent cations (Al, Fe, Cr)3+ in an octahedral/tetrahedral framework with [SiO4]4− occupying the tetrahedra.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Garnets are most often found in the dodecahedral crystal habit, but are also commonly found in the trapezohedron habit as well as the hexoctahedral habit.<ref name="Klein-1993" /> They crystallize in the cubic system, having three axes that are all of equal length and perpendicular to one another but are never actually cubic because, despite being isometric, the {100} and {111} families of planes are depleted.<ref name="Klein-1993" /> Garnets do not have any cleavage planes, so, when they fracture under stress, sharp, irregular (conchoidal) pieces are formed.<ref>Template:Cite book</ref>
- Pyrope cp.jpg
Crystal structure of pyrope garnet. White spheres are oxygen; black, silicon; blue, aluminium; and red, magnesium.
- Pyrope crystal structure.jpg
Same view, with ion sizes reduced to better show all ions
- Pyrope si.jpg
Silicon ion size exaggerated to emphasize silica tetrahedra
HardnessEdit
Because the chemical composition of garnet varies, the atomic bonds in some species are stronger than in others. As a result, this mineral group shows a range of hardness on the Mohs scale of about 6.0 to 7.5.<ref>Template:Cite book</ref> The harder species like almandine are often used for abrasive purposes.<ref>Template:Cite journal</ref>
Magnetics used in garnet series identificationEdit
For gem identification purposes, a pick-up response to a strong neodymium magnet separates garnet from all other natural transparent gemstones commonly used in the jewelry trade. Magnetic susceptibility measurements in conjunction with refractive index can be used to distinguish garnet species and varieties, and determine the composition of garnets in terms of percentages of end-member species within an individual gem.<ref>D. B. Hoover, B. Williams, C. Williams and C. Mitchell, Magnetic susceptibility, a better approach to defining garnets Template:Webarchive, The Journal of Gemmology, 2008, Volume 31, No. 3/4 pp. 91–103</ref>
Garnet group end member speciesEdit
Pyralspite garnets – aluminium in Y siteEdit
- Almandine: Fe3Al2(SiO4)3
- Pyrope: Mg3Al2(SiO4)3
- Spessartine: Mn3Al2(SiO4)3
AlmandineEdit
Almandine, sometimes incorrectly called almandite, is the modern gem known as carbuncle (though originally almost any red gemstone was known by this name).<ref name="lytvynov">Template:Cite journal</ref> The term "carbuncle" is derived from the Latin meaning "live coal" or burning charcoal. The name Almandine is a corruption of Alabanda, a region in Asia Minor where these stones were cut in ancient times. Chemically, almandine is an iron-aluminium garnet with the formula Fe3Al2(SiO4)3; the deep red transparent stones are often called precious garnet and are used as gemstones (being the most common of the gem garnets).<ref>Template:Cite journal</ref> Almandine occurs in metamorphic rocks like mica schists, associated with minerals such as staurolite, kyanite, andalusite, and others.Template:Sfn Almandine has nicknames of Oriental garnet,<ref>Template:Cite book</ref> almandine ruby, and carbuncle.<ref name="lytvynov"/>
PyropeEdit
Pyrope (from the Greek pyrōpós meaning "firelike")<ref name="Klein-1993" /> is red in color and chemically an aluminium silicate with the formula Mg3Al2(SiO4)3, though the magnesium can be replaced in part by calcium and ferrous iron. The color of pyrope varies from deep red to black. Pyrope and spessartine gemstones have been recovered from the Sloan diamondiferous kimberlites in Colorado, from the Bishop Conglomerate and in a Tertiary age lamprophyre at Cedar Mountain in Wyoming.<ref>Template:Cite book</ref>
A variety of pyrope from Macon County, North Carolina is a violet-red shade and has been called rhodolite, Greek for "rose". In chemical composition it may be considered as essentially an isomorphous mixture of pyrope and almandine, in the proportion of two parts pyrope to one part almandine.<ref name="schlegel">Template:Cite journal</ref> Pyrope has tradenames some of which are misnomers; Cape ruby, Arizona ruby, California ruby, Rocky Mountain ruby, and Bohemian ruby from the Czech Republic.<ref name="lytvynov"/>
Pyrope is an indicator mineral for high-pressure rocks. Mantle-derived rocks (peridotites and eclogites) commonly contain a pyrope variety.Template:Sfn
SpessartineEdit
Spessartine or spessartite is manganese aluminium garnet, Mn3Al2(SiO4)3. Its name is derived from Spessart in Bavaria.<ref name="Klein-1993"/> It occurs most often in skarns,<ref name="Klein-1993"/> granite pegmatite and allied rock types,Template:Sfn and in certain low grade metamorphic phyllites. Spessartine of an orange-yellow is found in Madagascar.<ref>Template:Cite journal</ref> Violet-red spessartines are found in rhyolites in Colorado<ref name="schlegel"/> Template:Citation needed span
Pyrope–spessartine (blue garnet or color-change garnet)Edit
Blue pyrope–spessartine garnets were discovered in the late 1990s in Bekily, Madagascar. This type has also been found in parts of the United States, Russia, Kenya, Tanzania, and Turkey. It changes color from blue-green to purple depending on the color temperature of viewing light, as a result of the relatively high amounts of vanadium (about 1 wt.% V2O3).<ref name="blue">Template:Cite journal</ref>
Other varieties of color-changing garnets exist. In daylight, their color ranges from shades of green, beige, brown, gray, and blue, but in incandescent light, they appear a reddish or purplish/pink color.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
This is the rarest type of garnet. Because of its color-changing quality, this kind of garnet resembles alexandrite.<ref>Template:Cite journal</ref>
Ugrandite group – calcium in X siteEdit
AndraditeEdit
Andradite is a calcium-iron garnet, Ca3Fe2(SiO4)3, is of variable composition and may be red, yellow, brown, green or black.<ref name="Klein-1993"/> The recognized varieties are demantoid (green), melanite (black),<ref name="Klein-1993"/> and topazolite (yellow or green). The red-brown translucent variety of colophonite is recognized as a partially obsolete name.<ref name="mindat">Colophonite (a variety of Andradite): information about the mineral colophonite in the Mindat database.</ref> Andradite is found in skarns<ref name="Klein-1993"/> and in deep-seated igneous rocks like syenite<ref>Template:Cite journal</ref> as well as serpentines<ref>Template:Cite journal</ref> and greenschists.<ref>Template:Cite journal</ref> Demantoid is one of the most prized of garnet varieties.<ref>Template:Cite journal</ref>
GrossularEdit
Grossular is a calcium-aluminium garnet with the formula Ca3Al2(SiO4)3, though the calcium may in part be replaced by ferrous iron and the aluminium by ferric iron. The name grossular is derived from the botanical name for the gooseberry, grossularia, in reference to the green garnet of this composition that is found in Siberia. Other shades include cinnamon brown (cinnamon stone variety), red, and yellow.<ref name="Klein-1993"/> Because of its inferior hardness to zircon, which the yellow crystals resemble, they have also been called hessonite from the Greek meaning inferior.<ref>Template:Cite journal</ref> Grossular is found in skarns,<ref name="Klein-1993"/> contact metamorphosed limestones with vesuvianite, diopside, wollastonite and wernerite.
Grossular garnet from Kenya and Tanzania has been called tsavorite. Tsavorite was first described in the 1960s in the Tsavo area of Kenya, from which the gem takes its name.<ref>Mindat.org - Tsavorite</ref><ref>Template:Cite journal</ref>
UvaroviteEdit
Uvarovite is a calcium chromium garnet with the formula Ca3Cr2(SiO4)3. This is a rather rare garnet, bright green in color, usually found as small crystals associated with chromite in peridotite, serpentinite, and kimberlites. It is found in crystalline marbles and schists in the Ural Mountains of Russia and Outokumpu, Finland. Uvarovite is named for Count Uvaro, a Russian imperial statesman.<ref name="Klein-1993" />
Less common speciesEdit
- Calcium in X site
- Goldmanite: Template:Chem2
- Kimzeyite: Template:Chem2
- Morimotoite: Template:Chem2
- Schorlomite: Template:Chem2
- Hydroxide bearing – calcium in X site
- Hydrogrossular: Template:Chem2
- Hibschite: Template:Chem2 (where x is between 0.2 and 1.5)
- Katoite: Template:Chem2 (where x is greater than 1.5)
- Hydrogrossular: Template:Chem2
- Magnesium or manganese in X site
KnorringiteEdit
Knorringite is a magnesium-chromium garnet species with the formula Mg3Cr2(SiO4)3. Pure endmember knorringite never occurs in nature. Pyrope rich in the knorringite component is only formed under high pressure and is often found in kimberlites. It is used as an indicator mineral in the search for diamonds.<ref>Template:Cite journal</ref>
Garnet structural groupEdit
- Formula: X3Z2(TO4)3 (X = Ca, Fe, etc., Z = Al, Cr, etc., T = Si, As, V, Fe, Al)
- All are cubic or strongly pseudocubic.
| IMA/CNMNC Nickel-Strunz Mineral class |
Mineral name | Formula | Crystal system | Point group | Space group |
|---|---|---|---|---|---|
| 04 Oxide | Bitikleite-(SnAl) | Ca3SnSb(AlO4)3 | isometric | mTemplate:Overlinem | IaTemplate:Overlined |
| 04 Oxide | Bitikleite-(SnFe) | Ca3(SnSb5+)(Fe3+O4)3 | isometric | mTemplate:Overlinem | IaTemplate:Overlined |
| 04 Oxide | Bitikleite-(ZrFe) | Ca3SbZr(Fe3+O4)3 | isometric | mTemplate:Overlinem | IaTemplate:Overlined |
| 04 Tellurate | Yafsoanite | Ca3Zn3(Te6+O6)2 | isometric | mTemplate:Overlinem or 432 |
IaTemplate:Overlined or I4132 |
| 08 Arsenate | Berzeliite | NaCa2Mg2(AsO4)3 | isometric | mTemplate:Overlinem | IaTemplate:Overlined |
| 08 Vanadate | Palenzonaite | NaCa2Mn2+2(VO4)3 | isometric | mTemplate:Overlinem | IaTemplate:Overlined |
| 08 Vanadate | Schäferite | NaCa2Mg2(VO4)3 | isometric | mTemplate:Overlinem | IaTemplate:Overlined |
- IMA/CNMNC – Nickel-Strunz – Mineral subclass: 09.A Nesosilicate
- Nickel-Strunz classification: 09.AD.25
- References: Mindat.org; mineral name, chemical formula and space group (American Mineralogist Crystal Structure Database) of the IMA Database of Mineral Properties/ RRUFF Project, Univ. of Arizona, was preferred most of the time. Minor components in formulae have been left out to highlight the dominant chemical endmember that defines each species.
Synthetic garnetsEdit
Also known as rare-earth garnets.
The crystallographic structure of garnets has been expanded from the prototype to include chemicals with the general formula A3B2(CO4)3. Besides silicon, a large number of elements have been put on the C site, including germanium, gallium, aluminum, vanadium and iron.<ref>S. Geller Crystal chemistry of the garnets Zeitschrift für Kristallographie, 125(125), pp. 1–47 (1967) {{#invoke:doi|main}}</ref>
Yttrium aluminium garnet (YAG), Y3Al2(AlO4)3, is used for synthetic gemstones. Due to its fairly high refractive index, YAG was used as a diamond simulant in the 1970s until the methods of producing the more advanced simulant cubic zirconia in commercial quantities were developed. When doped with neodymium (Nd3+), erbium or gadolinium YAG may be used as the lasing medium in Nd:YAG lasers,<ref>Template:Cite book</ref> Er:YAG lasers and Gd:YAG lasers respectively. These doped YAG lasers are used in medical procedures including laser skin resurfacing, dentistry, and ophthalmology.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>
Interesting magnetic properties arise when the appropriate elements are used. In yttrium iron garnet (YIG), Y3Fe2(FeO4)3, the five iron(III) ions occupy two octahedral and three tetrahedral sites, with the yttrium(III) ions coordinated by eight oxygen ions in an irregular cube. The iron ions in the two coordination sites exhibit different spins, resulting in magnetic behavior. YIG is a ferrimagnetic material having a Curie temperature of 550 K. Yttrium iron garnet can be made into YIG spheres, which serve as magnetically tunable filters and resonators for microwave frequencies.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Lutetium aluminium garnet (LuAG), Template:Chem2, is an inorganic compound with a unique crystal structure primarily known for its use in high-efficiency laser devices. LuAG is also useful in the synthesis of transparent ceramics.<ref>Template:Cite journal</ref> LuAG is particularly favored over other crystals for its high density and thermal conductivity; it has a relatively small lattice constant in comparison to the other rare-earth garnets, which results in a higher density producing a crystal field with narrower linewidths and greater energy level splitting in absorption and emission.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Terbium gallium garnet (TGG), Template:Chem2, is a Faraday rotator material with excellent transparency properties and is very resistant to laser damage. TGG can be used in optical isolators for laser systems, in optical circulators for fiber optic systems, in optical modulators, and in current and magnetic field sensors.<ref>Template:Cite journalTemplate:Dead link</ref>
Another example is gadolinium gallium garnet (GGG), Template:Chem2 which is synthesized for use as a substrate for liquid-phase epitaxy of magnetic garnet films for bubble memory and magneto-optical applications.Template:Citation needed
Geological importanceEdit
The mineral garnet is commonly found in metamorphic and to a lesser extent, igneous rocks. Most natural garnets are compositionally zoned and contain inclusions.<ref>Template:Cite book</ref> Its crystal lattice structure is stable at high pressures and temperatures and is thus found in green-schist facies metamorphic rocks including gneiss, hornblende schist, and mica schist.<ref name="Klein-1985">Template:Cite book</ref> The composition that is stable at the pressure and temperature conditions of Earth's mantle is pyrope, which is often found in peridotites and kimberlites, as well as the serpentines that form from them.<ref name="Klein-1985" /> Garnets are unique in that they can record the pressures and temperatures of peak metamorphism and are used as geobarometers and geothermometers in the study of geothermobarometry which determines "P-T Paths", Pressure-Temperature Paths. Garnets are used as an index mineral in the delineation of isograds in metamorphic rocks.<ref name="Klein-1985" /> Compositional zoning and inclusions can mark the change from growth of the crystals at low temperatures to higher temperatures.<ref name="Teaching Phase Equilibria">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Garnets that are not compositionally zoned more than likely experienced ultra high temperatures (above 700 °C) that led to diffusion of major elements within the crystal lattice, effectively homogenizing the crystal<ref name="Teaching Phase Equilibria" /> or they were never zoned. Garnets can also form metamorphic textures that can help interpret structural histories.<ref name="Teaching Phase Equilibria" />
In addition to being used to devolve conditions of metamorphism, garnets can be used to date certain geologic events. Garnet has been developed as a U-Pb geochronometer, to date the age of crystallization<ref>Template:Cite journal</ref> as well as a thermochronometer in the (U-Th)/He system<ref>Template:Cite journal</ref> to date timing of cooling below a closure temperature.
Garnets can be chemically altered and most often alter to serpentine, talc, and chlorite.<ref name="Klein-1985" />
Largest garnet crystalEdit
The open-pit Barton Garnet Mine, located at Gore Mountain in the Adirondack Mountains, yields the world's largest single crystals of garnet; diameters range from 5 to 35 cm and commonly average 10–18 cm.<ref name="Geophere">Template:Cite journal</ref>
Gore Mountain garnets are unique in many respects, and considerable effort has been made to determine the timing of garnet growth. The first dating was that of Basu et al. (1989), who used plagioclase-hornblende-garnet to produce a Sm/Nd isochron that yielded an age of 1059 ± 19 Ma. Mezger et al. (1992) conducted their own Sm/Nd investigation using hornblende and the drilled core of a 50 cm garnet to produce an isochron age of 1051 ± 4 Ma. Connelly (2006) utilized seven different fractions of a Gore Mountain garnet to obtain a Lu-Hf isochron age of 1046.6 ± 6 Ma. It is therefore concluded with confidence that the garnets formed at 1049 ± 5 Ma, the average of the three determinations. This is also the local age of peak metamorphism in the 1090–1040 Ma Ottawan phase of the Grenvillian orogeny and serves as a critical data point in ascertaining the evolution of the megacrystic garnet deposits.<ref name="Geophere"/>
UsesEdit
GemstonesEdit
Red garnets were the most commonly used gemstones in the Late Antique Roman world, and the Migration Period art of the "barbarian" peoples who took over the territory of the Western Roman Empire. They were especially used inlaid in gold cells in the cloisonné technique, a style often just called garnet cloisonné, found from Anglo-Saxon England, as at Sutton Hoo, to the Black Sea. Thousands of Tamraparniyan gold, silver and red garnet shipments were made in the old world, including to Rome, Greece, the Middle East, Serica and Anglo Saxons; recent findings such as the Staffordshire Hoard and the pendant of the Winfarthing Woman skeleton of Norfolk confirm an established gem trade route with South India and Tamraparni (ancient Sri Lanka), known from antiquity for its production of gemstones.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Pure crystals of garnet are still used as gemstones. The gemstone varieties occur in shades of green, red, yellow, and orange.<ref>Geological Sciences at University of Texas, Austin. Geo.utexas.edu. Retrieved on 2011-12-25.</ref> In the United States it is known as the birthstone for January.<ref name="GRG">Gemological Institute of America, GIA Gem Reference Guide 1995, Template:ISBN</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Kunz, George F. (1913). The curious lore of precious stones. Lippincott. pp. 275–306, pp. 319-320</ref> It is also the birthstone of Aquarius and Capricorn in tropical astrology.<ref>Knuth, Bruce G. (2007). Gems in Myth, Legend and Lore (Revised edition). Parachute: Jewelers Press. p. 294.</ref><ref>Kunz (1913), pp. 345–347</ref> The garnet family is one of the most complex in the gem world. It is not a single species, but is composed of multiple species and varieties.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Almandine garnet is the state mineral of Connecticut,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>State of Connecticut, Sites º Seals º Symbols Template:Webarchive; Connecticut State Register & Manual; retrieved on December 20, 2008</ref> star garnet is the state gemstone of Idaho,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> garnet is the state gemstone of New York,<ref name="Minerals of New York State">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>New York State Gem Template:Webarchive; State Symbols USA; retrieved on October 12, 2007</ref> and grossular garnet is the state gemstone of Vermont.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Industrial usesEdit
Garnet sand is a good abrasive, and a common replacement for silica sand in abrasive blasting operations. Alluvial garnet grains which are rounder are more suitable for such blasting treatments. Mixed with very high pressure water, garnet is used to cut steel and other materials in water jets. For water jet cutting, garnet extracted from hard rock is suitable since it is more angular in form, therefore more efficient in cutting.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Garnet paper is favored by cabinetmakers for finishing bare wood.<ref>Template:Cite book</ref>
Garnet sand is also used for water filtration media.
As an abrasive, garnet can be broadly divided into two categories; blasting grade and water jet grade. The garnet, as it is mined and collected, is crushed to finer grains; all pieces which are larger than 60 mesh (250 micrometers) are normally used for sand blasting. The pieces between 60 mesh (250 micrometers) and 200 mesh (74 micrometers) are normally used for water jet cutting. The remaining garnet pieces that are finer than 200 mesh (74 micrometers) are used for glass polishing and lapping. Regardless of the application, the larger grain sizes are used for faster work and the smaller ones are used for finer finishes.<ref>Template:Cite news</ref>
There are different kinds of abrasive garnets which can be divided based on their origin. The largest source of abrasive garnet today is garnet-rich beach sand which is quite abundant on Indian and Australian coasts and the main producers today are Australia and India.<ref>Template:Cite book</ref>
This material is particularly popular due to its consistent supplies, huge quantities and clean material. The common problems with this material are the presence of ilmenite and chloride compounds. Since the material has been naturally crushed and ground on the beaches for past centuries, the material is normally available in fine sizes only. Most of the garnet at the Tuticorin beach in south India is 80 mesh, and ranges from 56 mesh to 100 mesh size.Template:Citation needed
River garnet is particularly abundant in Australia. The river sand garnet occurs as a placer deposit.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Rock garnet is perhaps the garnet type used for the longest period of time. This type of garnet is produced in America, China and western India. These crystals are crushed in mills and then purified by wind blowing, magnetic separation, sieving and, if required, washing. Being freshly crushed, this garnet has the sharpest edges and therefore performs far better than other kinds of garnet. Both the river and the beach garnet suffer from the tumbling effect of hundreds of thousands of years which rounds off the edges. Gore Mountain Garnet from Warren County, New York, USA, is a significant source of rock garnet for use as an industrial abrasive.<ref name="Klein-1993" />
See alsoEdit
ReferencesEdit
Further readingEdit
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., Wiley, Template:ISBN
- Color Encyclopedia of Gemstones, Template:ISBN
External linksEdit
- http://www.gemstonemagnetism.com contains a comprehensive section about garnets and garnet magnetism.
- USGS Garnet locations – USA Template:Webarchive
- http://gemstone.org/education/gem-by-gem/154-garnet
- http://www.mindat.org/min-10272.html
- Blog post on garnets on the Law Library of Congress's blog
- https://www.birthstone.guide/garnet-birthstone-meaning Garnet birthstone stories