Editing Axinite (section)

{{Infobox mineral
|boxbgcolor=#756050| name        = Axinite
| category    = [[Cyclosilicate]]s
| boxwidth    = 
| boxtextcolor= #FFFFFF
| image       = Axinite-Mn - Canta, Lima, Peru.jpg
| caption     = Manganaxinite 
| formula     = {{chem2|(Ca,Fe,Mn)3Al2BO3Si4O12OH}} or {{chem2|Ca2(Fe,Mn)Al2BSi4O15(OH)}}
|IMAsymbol=Ax<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|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>
| strunz      = 9.BD.20
| system      = [[Triclinic]]
| class       = Pinacoidal ({{overline|1}}) <br/><small>(same [[H-M symbol]])</small>
| symmetry    = ''P''{{overline|1}}
| color       = Reddish brown to yellow to colorless. Blue, violet, grey.
| habit       = Tabular, wedge shaped crystals
| cleavage    = Good on {100}
| fracture    = Conchoidal
| mohs        = 6.0–7.5
| luster      = Vitreous
| refractive  = n<sub>α</sub> = 1.672–1.693<br /> n<sub>β</sub> = 1.677–1.701<br /> n<sub>γ</sub> = 1.681–1.704
| opticalprop = Biaxial (−)
| birefringence = δ = 0.011
| pleochroism = Strong
| streak      = White
| gravity     = 3.18–3.37
| melt        = 
| fusibility  = 
| solubility  = 
| other       = 
| references  = <ref name=Galleries>[http://mineral.galleries.com/Minerals/Silicate/AXINITE/AXINITE.htm Axinite] {{webarchive |url=https://web.archive.org/web/20081119075930/http://mineral.galleries.com/Minerals/Silicate/AXINITE/AXINITE.htm |date=November 19, 2008 }}. Mineral Galleries</ref><ref>[http://www.mindat.org/min-440.html Axinite]. Mindat</ref>
}}

'''Axinite''' is a brown to violet-brown, or reddish-brown bladed group of [[mineral]]s composed of [[calcium]] [[aluminium]] [[boron|boro]]-[[silicon|silicate]], {{chem2|(Ca,Fe,Mn)3Al2BO3Si4O12OH}}. Axinite is [[pyroelectricity|pyroelectric]] and [[piezoelectric]].

The axinite group includes:
*Axinite-(Fe) or ferroaxinite, Ca<sub>2</sub>Fe<sup>2+</sup>Al<sub>2</sub>BOSi<sub>4</sub>O<sub>15</sub>(OH) iron rich, clove-brown, brown, plum-blue, pearl-gray<ref>[http://rruff.info/doclib/hom/ferroaxinite.pdf Handbook of Mineralogy: Ferroaxinite]</ref>
*[[Axinite-(Mg)]] or magnesioaxinite, Ca<sub>2</sub>MgAl<sub>2</sub>BOSi<sub>4</sub>O<sub>15</sub>(OH) magnesium rich, pale blue to pale violet; light brown to light pink<ref>[http://rruff.info/doclib/hom/magnesioaxinite.pdf  Handbook of Mineralogy: Magnesioaxinite]</ref>
*Axinite-(Mn) or manganaxinite, Ca<sub>2</sub>Mn<sup>2+</sup>Al<sub>2</sub>BOSi<sub>4</sub>O<sub>15</sub>(OH) manganese rich, honey-yellow, clove-brown, brown to blue<ref>[http://rruff.info/doclib/hom/manganaxinite.pdf Handbook of Mineralogy: Manganaxinite]</ref>
*Tinzenite (CaFe<sup>2+</sup>Mn<sup>2+</sup>)<sub>3</sub>Al<sub>2</sub>BOSi<sub>4</sub>O<sub>15</sub>(OH) iron – manganese intermediate, yellow, brownish yellow-green<ref>[http://rruff.info/doclib/hom/tinzenite.pdf Handbook of Mineralogy: Tinzenite]</ref>

Axinite is sometimes used as a gemstone.<ref>Tables of Gemstone Identification
By Roger Dedeyne, Ivo Quintens p.147</ref>