Humite: Difference between revisions
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It was first described in 1813 and named for [[Abraham Hume]] (1749-1838). |
It was first described in 1813 and named for [[Abraham Hume]] (1749-1838). |
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Humite is also used as the name of a group of closely related minerals -- humite, [[clinohumite]], [[chondrodite]], and [[norbergite]]. These minerals are similar in structure and in chemistry. Deer et al. (1997) note that a general formula for the humite-group minerals can be simply expressed as nM<sub>2</sub>SiO<sub>4</sub> . M(OH,F)<sub>2</sub> , where M is Mg, Fe, Ti etc. and n = 1 (norbergite), 2 (chondrodite), 3 (humite), and 4 (clinohumite). Deer et al. (1997) also note that although the formula above correctly describes the chemistries of these minerals, structural formulas are more complex. |
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==See also== |
==See also== |
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* [[Jerrygibbsite]] |
* [[Jerrygibbsite]] |
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==References== |
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*Deer, W. A., Howie, R. A., and Zussman, J., 1997, ''Rock-forming minerals: Volume 1A, Second Edition, Orthosilicates.'' The Geological Society, Bath, UK. ISBN 1-897799-8-8 |
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==External links== |
==External links== |
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Revision as of 19:35, 28 June 2008
Humite is an orthorhombic mineral of a transparent vitreous brown to orange color. It is found in the volcanically ejected masses of Vesuvius. It is a nesosilicate of iron and magnesium which also contains fluorine and hydroxide. The formula is: (Mg,Fe)7(SiO4)3(F,OH)2.
It was first described in 1813 and named for Abraham Hume (1749-1838).
Humite is also used as the name of a group of closely related minerals -- humite, clinohumite, chondrodite, and norbergite. These minerals are similar in structure and in chemistry. Deer et al. (1997) note that a general formula for the humite-group minerals can be simply expressed as nM2SiO4 . M(OH,F)2 , where M is Mg, Fe, Ti etc. and n = 1 (norbergite), 2 (chondrodite), 3 (humite), and 4 (clinohumite). Deer et al. (1997) also note that although the formula above correctly describes the chemistries of these minerals, structural formulas are more complex.
See also
References
- Deer, W. A., Howie, R. A., and Zussman, J., 1997, Rock-forming minerals: Volume 1A, Second Edition, Orthosilicates. The Geological Society, Bath, UK. ISBN 1-897799-8-8
External links
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