Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
Tephroite
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
{{distinguish|tephrite}} {{infobox mineral | name = Tephroite | category = [[Silicate mineral]] | boxwidth = | boxbgcolor = | image = Tephroite Manganese silicate Kaao Mine Tochigi-ken Honshu Japan 1816.jpg | imagesize = | alt = | caption = Tephroite from Japan | formula = Mn<sub>2</sub>SiO<sub>4</sub> | IMAsymbol = Tep<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = | strunz = | dana = | system = [[Orthorhombic]] | class = Dipyramidal (mmm) <br/>[[H-M symbol]]: (2/m 2/m 2/m) | symmetry = ''Pnma'' (no. 62) | unit cell = a = 4.88(2) [[Ångström|Å]], b = 10.61(2) Å <br/>c = 6.24(2) Å; Z = 4 | color = Olive-green, bluish green, gray, °esh-red, reddish brown; pale green in thin section, may be colorless | colour = | habit = Crystals typically short, prismatic, to 4 cm, or anhedral, equidimensional. Commonly in disseminated grains, compact, or massive. | twinning = Uncommon on {011} | cleavage = {010}, distinct; {001}, imperfect | fracture = Uneven to conchoidal | tenacity = Brittle | mohs = 6 | luster = Vitreous to greasy | streak = Pale gray | diaphaneity = Transparent to translucent | gravity = 3.87 – 4.12 | density = | polish = | opticalprop = Biaxial (−) | refractive = n<sub>α</sub> = 1.759 n<sub>β</sub> = 1.797 n<sub>γ</sub> = 1.860 | birefringence = δ = 0.101 | pleochroism = Weak; X = brownish red; Y = reddish; Z = greenish blue. | 2V = Measured: 60° to 70°, Calculated: 78° | dispersion = | extinction = | length fast/slow = | fluorescence= | absorption = | melt = | fusibility = | diagnostic = | solubility = | other = | alteration = | references = <ref name=Handbook>http://rruff.geo.arizona.edu/doclib/hom/tephroite.pdf Handbook of Mineralogy</ref><ref name=Mindat>http://www.mindat.org/min-3913.html Mindat.org</ref><ref name=Webmin>http://webmineral.com/data/Tephroite.shtml Webmineral data</ref> }} '''Tephroite''' is the [[manganese]] [[endmember]] of the [[olivine]] group of [[nesosilicate]] minerals with the formula [[manganese|Mn]]<sub>2</sub>[[silicon|Si]][[oxygen|O]]<sub>4</sub>. A solid solution series exists between tephroite and its analogues, the group endmembers [[fayalite]] and [[forsterite]]. Divalent iron or magnesium may readily replace manganese in the olivine crystal structure. It was first described for an occurrence at the [[Sterling Hill Mine]] and [[Franklin, New Jersey]], United States.<ref name=Mindat/> It occurs in iron-manganese [[ore deposit]]s and their related [[skarn]]s. It also occurs in [[Metamorphism|metamorphosed]] manganese-rich sediments. It occurs in association with: [[zincite]], [[willemite]], [[franklinite]], [[rhodonite]], [[jacobsite]], [[diopside]], [[gageite]], [[bustamite]], [[manganocalcite]], [[glaucochroite]], [[calcite]], [[banalsite]] and [[alleghanyite]].<ref name=Handbook/> It can also be found in [[England]] and Sweden. Tephroite has a hardness of 6 and a [[specific gravity]] of approximately 4.1, which is heavy for non-metallic minerals. Its name comes from the [[Ancient Greek language|Greek]] ''tephros'', "ash gray", for its color.<ref name=Webmin/> It can also be found olive-green, greenish-blue, pink, or brown. Other names for tephroite include mangan olivine and mangan peridot. ==References== {{Reflist}} *[https://web.archive.org/web/20061017063718/http://mineral.galleries.com/minerals/silicate/tephroit/tephroit.htm Mineral galleries] {{Manganese minerals}} [[Category:Manganese(II) minerals]] [[Category:Nesosilicates]] [[Category:Orthorhombic minerals]] [[Category:Minerals in space group 62]] {{silicate-mineral-stub}}
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)
Pages transcluded onto the current version of this page
(
help
)
:
Template:Distinguish
(
edit
)
Template:Infobox mineral
(
edit
)
Template:Manganese minerals
(
edit
)
Template:Reflist
(
edit
)
Template:Silicate-mineral-stub
(
edit
)