Humite
| Humite | |
|---|---|
 Humite specimen, Italy | |
| Allgemein | |
| Kategorie | Nesosilicates |
| Formula (repeating unit) | (Mg,Fe)7(SiO4)3(F,OH)2. |
| Crystal system | Orthorhombic |
| Identification | |
| Color | Brown to orange color |
| Cleavage | Poor |
| Mohs scale hardness | 6-6.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent |
| Optical properties | Biaxial (+), a=1.607-1.643, b=1.619-1.653, g=1.639-1.675, bire=0.0320, 2V(Calc)=70-78, 2V(Meas)=68-81. Dispersion weak, r > v. |
| References | [1] |
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).[2]
See also
References
- ^ http://webmineral.com/data/Humite.shtml
- ^ Deer, W.; Howie, R.; Zussman, J. (1997). Rock-forming Minerals: Volume 1A, Second Edition, Orthosilicates. Bath, UK: The Geological Society. ISBN 189779988.
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External links
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