laumontite

laumontite
/loh mon"tuyt/, n.
a white zeolite mineral, chiefly hydrated silicate of aluminum and calcium.
[1795-1805; named after F. P. N. G. de Laumont (1747-1834), French mineralogist who discovered it; see -ITE1]

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 common hydrated calcium and sodium aluminosilicate mineral in the zeolite family, formulated CaAl2Si4O12·4H2O. Its white to yellow or gray prismatic crystals typically occur filling veins and vesicles in igneous rocks. It is one of the more abundant zeolites present in sedimentary rocks and is found, among other places, in Transylvania (Romania); in the Tirol, Austria; and in California, Oregon, and New Jersey, U.S. Its crystals have a framework structure of linked silicate and aluminate tetrahedra, water molecules, and large cations located within cavities. Cations such as calcium, sodium, and potassium readily replace one another in the structure, making laumontite useful in water softeners. For detailed physical properties, see zeolite (table).

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Universalium. 2010.

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Look at other dictionaries:

  • Laumontite — Catégorie IX : silicates[1] Laumontite mine Himalaya États Unis …   Wikipédia en Français

  • Laumontite — is a mineral, one of the zeolite group. Its molecular formula is Calcium(AluminiumSilicon|2Oxygen|6)2 middot;4H2O, a hydrated calcium aluminium silicate. Potassium or sodium may substitute for the calcium but only in very small amounts.It is… …   Wikipedia

  • Laumontite — Lau mont*ite, n. [From Dr. Laumont, the discoverer.] (Min.) A mineral, of a white color and vitreous luster. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles. [Written also {laumonite} …   The Collaborative International Dictionary of English

  • laumontite — ● laumontite nom féminin (de Laumont, nom propre) Aluminosilicate hydraté naturel de calcium, du groupe des zéolites …   Encyclopédie Universelle

  • laumontite — noun A mineral, of a white color and vitreous luster, with the chemical formula CaAlSiO middot;4HO. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles …   Wiktionary

  • laumontite — lau·mont·ite …   English syllables

  • laumontite — …   Useful english dictionary

  • laumonite — Laumontite Lau mont*ite, n. [From Dr. Laumont, the discoverer.] (Min.) A mineral, of a white color and vitreous luster. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles. [Written also… …   The Collaborative International Dictionary of English

  • Laumontit — (Museo Geominero de Madrid) Chemische Formel CaAl2Si4O12 · 4 H2O Mineralklasse Gerüstsilikat Zeolithgruppe 09.GB.10 (nach Strunz) 77.01 …   Deutsch Wikipedia

  • List of minerals K-M (complete) — It is currently not possible to have a complete list of minerals . The International Mineralogical Association is the international group that recognises new minerals and new mineral names, however minerals discovered before 1959 did not go… …   Wikipedia

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