# Tangeite

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> Markdown URL: https://mediated.wiki/source/Tangeite.md
> Source: https://en.wikipedia.org/wiki/Tangeite
> Source revision: 1310428318
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Infobox mineral
| name        = Tangeite
| image       = Tangeite.jpg
| imagesize   = 260px
| alt         = 
| caption     = 
| category    = [Phosphate mineral](/source/Phosphate_mineral)
| formula     = CaCu(VO<sub>4</sub>)(OH)
| IMAsymbol   = Tg<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      = 8.BH.35
| dana        = 41.05.01.06
| system      = [Orthorhombic](/source/Orthorhombic)
| class       = Disphenoidal (222) <br/>[H-M symbol](/source/H-M_symbol): (2 2 2)
| symmetry    = ''P''2<sub>1</sub>2<sub>1</sub>2<sub>1</sub>
| unit cell   = a = 7.45&nbsp;[Å](/source/%C3%85ngstr%C3%B6m), b = 9.26&nbsp;Å <br/>c = 5.91&nbsp;Å; Z&nbsp;=&nbsp;4
| color       = Yellow, yellow-green, olive green, green to dark green
| habit       = Rarely as short prismatic crystals, commonly as fibrous to botryoidal encrustations
| twinning    = 
| cleavage    = Perfect on {010}, good on {001}
| fracture    = 
| tenacity    = Brittle
| mohs        = 3.5
| luster      = Vitreous, pearly on cleavage faces
| streak      = Light yellow green
| diaphaneity = Transparent, Translucent
| gravity     = 3.75 - 3.84
| density     = 
| polish      = 
| opticalprop = Biaxial (-)
| refractive  = n<sub>α</sub> = 2.010 n<sub>β</sub> = 2.050 n<sub>γ</sub> = 2.090
| birefringence = 0.08
| pleochroism = 
| 2V          = 83° (measured)
| dispersion  = 
| extinction  = 
| length fast/slow = 
| fluorescence = 
| absorption  = 
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = 
| impurities  = 
| alteration  = 
| other       =
| prop1       =
| prop1text   = 
| references  =<ref name=mindat>[http://www.mindat.org/min-4073.html Tangeite] on [http://www.mindat.org/ Mindat]</ref><ref name=Webmin>[https://webmineral.com/data/Tangeite.shtml Tangeite data] on [http://webmineral.com/ Webmineral]</ref><ref name=HBM>[https://rruff.info/doclib/hom/tangeite.pdf Handbook of Mineralogy]</ref>
}}

'''Tangeite''', also known as calciovolborthite, is a [calcium](/source/calcium), [copper](/source/copper) [vanadate](/source/vanadate) [mineral](/source/mineral) with formula: CaCu(VO<sub>4</sub>)(OH). It occurs as a secondary mineral that can be found in [sandstone](/source/sandstone) and also in the [oxidized](/source/Redox) zones of [vanadium](/source/vanadium) bearing deposits. 

It was named in 1925 by Aleksandr Evgenievich Fersman for its discovery locality in the Tange Gorge, [Ferghana Valley](/source/Ferghana_Valley), [Alai Mountains](/source/Alai_Mountains), [Kyrgyzstan](/source/Kyrgyzstan).<ref name=mindat/>

==References==
{{Reflist}}

Category:Vanadate minerals
Category:Copper(II) minerals
Category:Orthorhombic minerals
Category:Minerals in space group 19
Category:Minerals described in 1925

{{mineral-stub}}

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