Humite

Humite

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.

ee also

* Jerrygibbsite

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

* [http://webmineral.com/data/Humite.shtml Webmineral]
* [http://www.mindat.org/min-1947.html Mindat w/ locations]


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  • Humite — Hum ite, n. [Named after Sir A. Hume.] (Min.) A mineral of a transparent vitreous brown color, found in the ejected masses of Vesuvius. It is a silicate of iron and magnesia, containing fluorine. [1913 Webster] …   The Collaborative International Dictionary of English

  • *humite — ● humite nom féminin (de Hume, nom propre) Silicate naturel de magnésium, avec du fer et du fluor, voisin des péridots …   Encyclopédie Universelle

  • humite — ▪ mineral  member of a group of layered silicate minerals related to the olivines that are nearly always restricted in occurrence to altered limestones and dolomites adjacent to acid or alkaline plutonic rocks and to skarns (skarn) (contact… …   Universalium

  • Humite — Croissance d un humite (en mauve) Ce groupe a d’étroites parentés cristallographiques, physiques, chimiques, et de paragenèse avec les silicates d alumine, il se rapproche aussi de la forstérite et il comprend, entre autres : La norbergite… …   Wikipédia en Français

  • humite — humusinės anglys statusas T sritis chemija apibrėžtis Iš durpių susidariusios anglys. atitikmenys: angl. humic coal; humite; humus coal rus. гумит; гумолит; гумусовый уголь ryšiai: sinonimas – humitas …   Chemijos terminų aiškinamasis žodynas

  • humite — humitas statusas T sritis chemija formulė (Mg,Fe)₇·[(OH,F)₂|(SiO₄)₃] atitikmenys: angl. humite rus. гумит …   Chemijos terminų aiškinamasis žodynas

  • humite group — noun : a group of isomorphous minerals consisting of olivine, chondrodite, humite, and clinohumite and closely resembling one another in chemical composition, physical properties, and crystallization …   Useful english dictionary

  • humite — hum·ite …   English syllables

  • humite — ˈhyüˌmīt noun ( s) Etymology: Sir Abraham Hume died 1838 English mineral collector + English ite : a white, yellow, brown, or red mineral Mg7Si3O12(F1OH)2 consisting of a basic magnesium silicate containing fluorine that is brittle and of… …   Useful english dictionary

  • Clinohumite — Side View of a cushion cut clinohumite gemstone, 21.34 carats (4.27 g), 17.8 x 16 mm General Category Mineral …   Wikipedia

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