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| references =<ref name=mindat>[http://www.mindat.org/min-4073.html Tangeite on Mindat.org]</ref><ref name=Webmin>[http://webmineral.com/data/Tangeite.shtml Tangeite data on Webmineral]</ref><ref name=HBM>[http://rruff.info/doclib/hom/tangeite.pdf Handbook of Mineralogy]</ref> |
| references =<ref name=mindat>[http://www.mindat.org/min-4073.html Tangeite] on [http://www.mindat.org/ Mindat.org]]</ref><ref name=Webmin>[http://webmineral.com/data/Tangeite.shtml Tangeite data] on [http://webmineral.com/ Webmineral]</ref><ref name=HBM>[http://rruff.info/doclib/hom/tangeite.pdf Handbook of Mineralogy]</ref> |
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Revision as of 19:34, 2 September 2013
| Tangeite | |
|---|---|
 | |
| General | |
| Category | Vanadate mineral |
| Formula (repeating unit) | CaCu(VO4)(OH) |
| Strunz classification | 08.BH.35 |
| Dana classification | 41.05.01.06 |
| Crystal system | Orthorhombic |
| Space group | Orthorhombic disphenoidal H-M symbol: (2 2 2) Space group: P 212121 |
| Unit cell | a = 7.45 Å, b = 9.26 Å, c = 5.91 Å; Z=4 |
| Identification | |
| Color | Yellow, yellow-green, olive green, green to dark green |
| Crystal habit | Rarely as short prismatic crystals, commonly as fibrous to botryoidal encrustations |
| Cleavage | Perfect on {010}, good on {001} |
| Tenacity | Brittle |
| Mohs scale hardness | 3.5 |
| Luster | Vitreous, pearly on cleavage faces |
| Streak | Light yellow green |
| Diaphaneity | Transparent, Translucent |
| Specific gravity | 3.75 - 3.84 |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 2.010 nβ = 2.050 nγ = 2.090 |
| Birefringence | 0.08 |
| 2V angle | 83° (measured) |
| References | [1][2][3] |
Tangeite, also known as calciovolborthite, is a calcium, copper vanadate mineral with formula: CaCu(VO4)(OH). It occurs as a secondary mineral that can be found in sandstone and also in the oxidized zones of vanadium bearing deposits. It was named in 1925 by Aleksandr Evgenievich Fersman for its discovery locality in the Tange Gorge, Ferghana Valley, Alai Mountains, Kyrgyzstan.[1]
References
- ^ a b Tangeite on Mindat.org]
- ^ Tangeite data on Webmineral
- ^ Handbook of Mineralogy
Look up Tangeite in Wiktionary, the free dictionary.
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