humite

humite

 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-metamorphic rocks) near iron-ore deposits. The humite group includes norbergite, chondrodite, humite, and clinohumite. These yellow to brown, moderately hard minerals have a layered structure; the olivine mineral forsterite, magnesium silicate (Mg2SiO4), alternates with brucite, magnesium hydroxide [Mg(OH)2], and differences in the physical properties and the crystallization result from differences in the stacking sequence. The humites rarely occur together in the same mass, but humite crystals have been found penetrated by clinohumite. For detailed physical properties, see olivine (table).

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  • 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:… …   Wikipedia

  • 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 — 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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