Zunyite
Zunyite | |
---|---|
![]() Sharp, pyramids of brown-red zunyite from Silver City, Tintic District, East Tintic Mountains, Juab County, Utah, US (size: 5.5 x 5 x 3.5 cm) | |
General | |
Category | Sorosilicates |
Formula (repeating unit) | Al13Si5O20(OH,F)18Cl |
IMA symbol | Znu[1] |
Strunz classification | 9.BJ.55 |
Crystal system | Isometric |
Crystal class | Hextetrahedral (43m) H-M symbol: (43m) |
Space group | F43m |
Unit cell | a = 13.8654 - 13.8882 Å; Z = 4 |
Identification | |
Color | Grayish white, flesh-red; colorless in thin section |
Crystal habit | Crystalline - occurs as well-formed fine sized crystals |
Twinning | On {111}, contact and penetration |
Cleavage | Good on {111} |
Fracture | Uneven |
Tenacity | Brittle |
Mohs scale hardness | 7 |
Luster | Vitreous |
Streak | White |
Diaphaneity | Transparent to translucent with inclusions |
Specific gravity | 2.874(5) (meas.) 2.87 - 2.90 (calc.) |
Optical properties | Isotropic |
Refractive index | n = 1.592 - 1.600 |
Other characteristics | May fluoresce red under UV |
References | [2][3][4] |
Zunyite is a sorosilicate mineral, Al13Si5O20(OH,F)18Cl, composed of aluminium, silicon, hydrogen, chlorine, oxygen, and fluorine.
Occurrence
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Zunyite-Quartz-62278.jpg/220px-Zunyite-Quartz-62278.jpg)
Zunyite occurs in highly aluminous shales and hydrothermally altered volcanic rocks. It occurs in association with pyrophyllite, kaolinite, alunite, diaspore, rutile, pyrite, hematite and quartz.[2]
It was discovered in 1884, and named for its discovery site, the Zuni mine in the Silverton District, San Juan County, Colorado.[3]
References
[edit]- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b Handbook of Mineralogy
- ^ a b Mindat.org
- ^ Web Mineral
- Glendale Community College; retrieved March 26, 2005.
- Euromin; retrieved March 26, 2005.
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