Analcime

Analcime

Infobox mineral
name = Analcime
category = Zeolite mineral
boxwidth =


caption =
formula = NaAlSi2O6·H2O
color = White, colorless, gray, pink, greenish, yellowish
habit = Typically in crystals, usually trpezohedrons, also massive to granular.
system = Cubic; tetragonal, orthorhombic, or monoclinic, pseudocubic, with degree of ordering.
twinning = Polysynthetic on [001] , [110]
cleavage = Very poor [100]
fracture = Uneven to subconchoidal
mohs = 5 - 5.5
luster = Vitreous
refractive = n = 1.479 - 1.493
opticalprop = Isotropic; anomalously biaxial (-)
pleochroism =
streak = white
gravity = 2.24 - 2.29
melt =
fusibility = 3.5
solubility =
other = Weakly piezoelectric; weakly electrostatic when rubbed or heated.
references = [http://rruff.geo.arizona.edu/doclib/hom/analcime.pdf Mineral Data Publishing]

Analcime or analcite (from the Greek "analkimos" - "weak") is a white, grey, or colourless tectosilicate mineral. Analcime consists of hydrated sodium aluminium silicate in cubic crystalline form. Its chemical formula is NaAlSi2O6·H2O. Minor amounts of potassium and calcium substitute for sodium. A silver bearing synthetic variety also exists (Ag-analcite).

Analcime is usually classified as a zeolite mineral, but structurally and chemically it is more similar to the feldspathoids. Analcime occurs as a primary mineral in analcime basalt and other alkaline igneous rocks. It also occurs as cavity and vesicle fillings associated with prehnite, calcite, and zeolites.

Locations include the Cyclopean Islands east off Sicily and near Trentino in northern Italy; Victoria in Australia; Kerguelen Island in the Indian Ocean; in the Lake Superior copper district of Michigan, Bergen Hill, New Jersey, Golden, Colorado in the United States; and at Cape Blomidon, Nova Scotia and Mont Saint-Hilaire, Quebec in Canada; and in Iceland.

ee also

* List of minerals

References

* Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., ISBN 0-471-80580-7
* [http://mineral.galleries.com/minerals/silicate/analcime/analcime.htm Mineral Galleries]
* [http://www.mindat.org/min-210.html Mindat.org]
* [http://webmineral.com/data/Analcime.shtml Webmineral.com]


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Look at other dictionaries:

  • Analcime — (cubique) Catégorie IX : silicates[1] Analcime Martinique (Vue 13x9 cm) XX5cm …   Wikipédia en Français

  • ANALCIME — Du grec analkis (faible), allusion au fait que l’analcime (ou analcite) s’électrise peu par friction. De formule brute [Si2Al6]Na,H2O, l’analcime est une des zéolites les plus communes. Elle peut être assimilée à un feldspathoïde dans les laves… …   Encyclopédie Universelle

  • analcime — [ə nal′sīt΄ə nal′sīm΄, ə nal′sēm΄] n. 〚< Gr an , not + alkoimos, strong: so named from its weak electricity when rubbed〛 a hard, colorless or white zeolite, NaAlSi2O6·H2O, commonly found in basalts: sometimes called analcite [ə nal′sīt΄] * * *… …   Universalium

  • Analcime — A*nal cime, n. [Gr. an priv. + a lkimos strong, alkh strength: cf. F. analcime.] (Min.) A white or flesh red mineral, of the zeolite family, occurring in isometric crystals. By friction, it acquires a weak electricity; hence its name. [1913… …   The Collaborative International Dictionary of English

  • análcime — s. m. O mesmo que analcita …   Dicionário da Língua Portuguesa

  • analcime — [ə nal′sīt΄ə nal′sīm΄, ə nal′sēm΄] n. [< Gr an , not + alkoimos, strong: so named from its weak electricity when rubbed] a hard, colorless or white zeolite, NaAlSi2O6·H2O, commonly found in basalts: sometimes called analcite [ə nal′sīt΄] …   English World dictionary

  • analcime — analcimas statusas T sritis chemija apibrėžtis Mineralas. formulė Na[AlSi₂O₆]·H₂O atitikmenys: angl. analcime rus. анальцим …   Chemijos terminų aiškinamasis žodynas

  • analcime — noun Etymology: French, from Greek analkimos weak, from an + alkimos strong, from alkē strength Date: 1803 a white or slightly colored mineral that consists of hydrated silicate of sodium and aluminum and occurs in various igneous rocks in… …   New Collegiate Dictionary

  • analcime — noun A mineral, a sodium aluminosilicate with a chemical formula NaAlSiO·HO, having a zeolite structure, found in alkaline basalts. Syn: analcite …   Wiktionary

  • analcime — anal·cime …   English syllables

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