# Apachite

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> Markdown URL: https://mediated.wiki/source/Apachite.md
> Source: https://en.wikipedia.org/wiki/Apachite
> Source revision: 1288288465
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{{Infobox mineral
| name = Apachite
| category = [Silicate mineral](/source/Silicate_mineral)
| image = 
| caption = 
| formula = Cu<sub>9</sub>Si<sub>10</sub>O<sub>29</sub>·11(H<sub>2</sub>O)
|IMAsymbol=Apa<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>
| molweight = 1514.92 g/mol
| strunz = 9.HE.10
| system = [Monoclinic](/source/Monoclinic) <br/>Unknown space group
| symmetry = 
| unit cell = a = 12.89, b = 6.055 <br/>c = 19.11&nbsp;[Å], β = 90.42° <br/>V = 1,490.24&nbsp;Å<sup>3</sup>; Z&nbsp;=&nbsp;2
| color = light blue
| habit = spherical, rounded aggregates
| twinning =
| cleavage =
| fracture =
| tenacity = 
| mohs = 2
| luster = nonmetallic, silky
| refractive = n<sub>α</sub>=1.610, n<sub>β</sub>=1.650, n<sub>γ</sub>=1.650
| opticalprop = biaxial negative 
| 2V  = Small
| birefringence = δ = 0.040
| pleochroism = 
| streak = light blue
| gravity = 3.37
| density = 
| melt = 
| fusibility = 
| diagnostic = 
| solubility = 
| diaphaneity = translucent
| other = 
| references = <ref name=Webmin>[http://webmineral.com/data/Apachite.shtml Webmineral data]</ref><ref name=HBM>[http://www.handbookofmineralogy.org/pdfs/apachite.pdf Handbook of Mineralogy]</ref>
}}
'''Apachite''' is a [copper](/source/copper) [silicate mineral](/source/silicate_mineral) with a general formula of Cu<sub>9</sub>Si<sub>10</sub>O<sub>29</sub>·11H<sub>2</sub>O.<ref>American Geological Institute.
[http://www.lib.utexas.edu/indexes/titles.php?let=G University of Texas Libraries] {{Webarchive|url=https://web.archive.org/web/20100610142415/http://www.lib.utexas.edu/indexes/titles.php?let=G |date=2010-06-10 }}. "Glossary of Geology." September 8, 2010</ref> The name is associated with the [Apache](/source/Apache) tribe residents of the area near the Christmas copper mine in the [Dripping Spring Mountains](/source/Dripping_Spring_Mountains) of [Gila County, Arizona](/source/Gila_County%2C_Arizona), the location where apachite was first described in 1980.<ref name=Mindat>[http://www.mindat.org/min-272.html Mindat.org]</ref>

Apachite has [monoclinic](/source/monoclinic) crystal symmetry, displaying 3 axes of unequal length with two of the axes perpendicular to each other as well as one angle oriented less than 90°.<ref name=HBM/>  The mineral has a maximum [birefringence](/source/birefringence) value of δ = 0.040 which describes the difference between the highest and lowest index of refraction for the mineral. Apachite is an [anisotropic](/source/anisotropic) mineral, so the velocity of light varies for this mineral.

It occurs in retrograde metamorphic environment as fractures cutting [garnet](/source/garnet) [diopside](/source/diopside) [skarn](/source/skarn). It occurs associated with [kinoite](/source/kinoite), [gilalite](/source/gilalite), [stringhamite](/source/stringhamite), [junitoite](/source/junitoite), [clinohedrite](/source/clinohedrite), [xonotlite](/source/xonotlite), [apophyllite](/source/apophyllite), [calcite](/source/calcite) and [tobermorite](/source/tobermorite).<ref name=HBM/>

== References ==
{{Reflist}}

Category:Copper(II) minerals
Category:Unclassified silicates
11
Category:Monoclinic minerals
Category:Minerals described in 1980

{{silicate-mineral-stub}}

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Adapted from the Wikipedia article [Apachite](https://en.wikipedia.org/wiki/Apachite) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Apachite?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.