Humite
From Infogalactic: the planetary knowledge core
| Humite | |
|---|---|
| 240px
Humite specimen, Italy
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| General | |
| Category | Nesosilicates |
| Formula (repeating unit) |
(Mg,Fe)7(SiO4)3(F,OH)2. |
| Strunz classification | 09.AF.50 |
| Crystal symmetry | Orthorhombic dipyramidal H–M Symbol (2/m 2/m 2/m) |
| Unit cell | a = 10.24 Å, b = 20.72 Å, c = 4.73 Å; Z = 4 |
| Identification | |
| Color | White, yellow, dark orange, brown |
| Crystal system | Orthorhombic |
| Cleavage | Poor |
| Fracture | Uneven to subconchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 6-6.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent |
| Specific gravity | 3.20 – 3.32 |
| Optical properties | Biaxial (+) |
| Refractive index | nα =1.607-1.643, nβ=1.619-1.653, nγ=1.639-1.675 |
| Birefringence | 0.0320 |
| 2V angle | Calculated = 70-78°, measured = 68-81° |
| Dispersion | Weak, r > v |
| References | [1][2][3] |
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Humite is a mineral found in the volcanically ejected masses of Vesuvius. It was first described in 1813 and named for Abraham Hume (1749–1838).[4]
See also
References
- ↑ Handbook of Mineralogy
- ↑ Webmineral data
- ↑ Mindat w/ locations
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
Media related to Lua error in package.lua at line 80: module 'strict' not found. at Wikimedia Commons
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