apophyllite

apophyllite
/euh pof"euh luyt', ap'euh fil"uyt/, n.
a hydrous potassium and calcium silicate mineral occurring in white crystals.
[1800-10; APO- + -PHYLL + -ITE1]

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      potassium-calcium fluoride-silicate mineral that is related structurally to the zeolite family of aluminosilicates. Like the zeolites, it has a high water content, although apophyllite has no aluminum in its chemical composition, which is approximately represented by the formula Ca4KFSi8O20·8H2O. In many ways it is more like the micas. It is usually found as glassy, white to grayish crystals with zeolite minerals in basalt, granite, and gneiss, as in Trentino, Italy; Belfast, N.Ire.; the Faroe Islands; Kimberley, S.Af.; and Guanajuato, Mex. For detailed physical properties, see silicate mineral (table).

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Universalium. 2010.

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Look at other dictionaries:

  • Apophyllite — Catégorie IX : silicates[1] apophyllite, Rio grande do sul, Brésil (28x14cm) …   Wikipédia en Français

  • APOPHYLLITE — L’apophyllite est un phyllosilicate. Cristallisant dans le système quadratique, ses cristaux se présentent sous la forme de prismes carrés, courts, tronqués, avec clivage basal à éclat nacré. C’est un minéral de couleur blanc, rose, jaune pâle ou …   Encyclopédie Universelle

  • Apophyllite — A*poph yl*lite, n. [Pref. apo + Gr. ? leaf; so called from its foliated structure or easy cleavage.] (Min.) A mineral relating to the zeolites, usually occurring in square prisms or octahedrons with pearly luster on the cleavage surface. It is a… …   The Collaborative International Dictionary of English

  • apophyllite — [ə päf′ə līt΄] n. [< APO + Gr phyllon, a leaf + ITE1: so named from its flaking off under the blowpipe] a semihard, hydrous, tetragonal mineral, KCa4Si8O20 (F,OH)·8H2O, usually found as variously colored crystals or flat, sheetlike plates …   English World dictionary

  • Apophyllite — Infobox mineral name = Apophyllite category = boxwidth = boxbgcolor = caption = formula = (K,Na)Ca4Si8 O20(F,OH) • 8H2O molweight = color = Usually white, colorless; also blue, green, brown, yellow, pink, violet habit = prismatic, tabular,… …   Wikipedia

  • apophyllite — apofilitas statusas T sritis chemija formulė KCa₄[(OH,F)|(Si₄O₁₀)₂]·8H₂O atitikmenys: angl. apophyllite rus. апофиллит …   Chemijos terminų aiškinamasis žodynas

  • apophyllite — noun Etymology: French, from apo + Greek phyllon leaf more at blade Date: 1810 a mineral composed of a hydrous silicate of potassium, calcium, and fluorine that is related to the zeolites and is usually found in transparent square prisms or white …   New Collegiate Dictionary

  • apophyllite — noun Any of several forms of a pale pink or green mineral being a mixed fluoride and silicate of potassium and calcium …   Wiktionary

  • apophyllite — ap·o·phyl·lite …   English syllables

  • apophyllite — a•poph•yl•lite [[t]əˈpɒf əˌlaɪt, ˌæp əˈfɪl aɪt[/t]] n. mir a hydrous potassium and calcium silicate mineral occurring in transparent crystals • Etymology: 1800–10 …   From formal English to slang

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