Willemite

Willemite

Infobox mineral
name = Willemite
category =
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caption = Willemite with franklinite from New Jersey
formula = Zinc silicate (Zn2SiO4)
molweight =
color = Blue to Green
habit =
system = Rhombohedral
twinning =
cleavage = {010}, {100} - imperfect
fracture = Uneven, Conchoidal
mohs = 5.5
luster = Vitreous - Resinous
refractive =
opticalprop =
birefringence =
pleochroism =
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gravity = 3.9 - 4.2
density =
melt =
fusibility =
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Willemite is a zinc silicate (Zn2SiO4) and a minor ore of zinc. It is highly fluorescent (green) under shortwave ultraviolet light. It occurs in all different colors in daylight, in fibrous masses, solid brown masses ("troostite"), and apple green gemmy masses. Willemite is usually formed as an alteration of previously existing sphalerite ore bodies, and is usually associated with limestone. It occurs in many places, but is best known from Arizona and the world famous zinc, iron, manganese deposits at Franklin Furnace, New Jersey. It often occurs with red zincite (zinc oxide) and franklinite (Fe,Mn,Zn)(Fe,Mn)2O4 (an iron rich zinc mineral occurring in sharp black isometric octahedral crystals and masses). Franklinite and zincite are not fluorescent.

It was discovered in 1830 and named after William I of the Netherlands.

ee also

*List of minerals
*List of minerals named after people

References

* [http://mineral.galleries.com/minerals/silicate/willemit/willemit.htm Mineral galleries]
* [http://www.mindat.org/min-4292.html Mindat]
* [http://webmineral.com/data/Willemite.shtml Webmineral]


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  • willémite — ● willémite nom féminin (du nom de Guillaume Ier [néerlandais Willem], roi de Hollande) Silicate naturel de zinc Zn2SiO4, rhomboédrique. (C est un minerai de zinc.) ⇒WILLEMITE, subst. fém. MINÉR. Silicate naturel de zinc, utilisé notamment pour… …   Encyclopédie Universelle

  • Willemite — Wil lem*ite, n. [From Willem I., king of the Netherlands.] (Min.) A silicate of zinc, usually occurring massive and of a greenish yellow color, also in reddish crystals (troostite) containing manganese. [1913 Webster] …   The Collaborative International Dictionary of English

  • willemite — [wil′ə mīt΄] n. [Du willemit, after Willem I (1772 1843), king of the Netherlands] a hard, rhombohedral mineral, Zn2SiO4, an ore of zinc; zinc silicate: cf. TROOSTITE …   English World dictionary

  • Willemite — 41°06′N 74°35′W / 41.1, 74.583 …   Wikipédia en Français

  • willemite — vilemitas statusas T sritis chemija apibrėžtis Mineralas. formulė Zn₂SiO₄ atitikmenys: angl. willemite rus. виллемит …   Chemijos terminų aiškinamasis žodynas

  • willemite — noun Etymology: German Willemit, from Willem (William) I died 1843 king of the Netherlands Date: circa 1841 a mineral of varying color consisting of a silicate of zinc and occurring especially in massive or granular forms …   New Collegiate Dictionary

  • willemite — /wil euh muyt /, n. a mineral, a zinc silicate, Zn2SiO4, sometimes containing manganese, occurring in prismatic crystals or granular masses, usually greenish, sometimes white, brown, or red: a minor ore of zinc. [1835 45; named after King WILLEM… …   Universalium

  • willemite — noun A rare mineral, zinc silicate, ZnSiO, that is a minor ore of zinc …   Wiktionary

  • willemite — wil·le·mì·te s.f. TS mineral. minerale molto raro di colore vario, costituito da silicato di zinco, che cristallizza nel sistema trigonale {{line}} {{/line}} DATA: 1875. ETIMO: der. del n.p.m. Willem, it. Guglielmo, nome del re di Olanda Willem I …   Dizionario italiano

  • willemite — wil·lem·ite …   English syllables

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