Any of a group of feldspars being mixed sodium and potassium aluminosilicates.
Syn: anorthose, soda microcline

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  • Anorthoclase — A*nor tho*clase, n. [Gr. ? priv. + orthoclase.] (Min.) A feldspar closely related to orthoclase, but triclinic. It is chiefly a silicate of sodium, potassium, and aluminium. Sp. gr., 2.57 2.60. [Webster 1913 Suppl.] || …   The Collaborative International Dictionary of English

  • Anorthoclase — Microcline Microcline Catégorie IX : silicates Microcline …   Wikipédia en Français

  • anorthoclase — /an awr theuh klays , klayz /, n. Mineral. a variety of microcline, rich in sodium and sometimes having a play of color: sometimes considered a variety of orthoclase. [AN 1 + ORTHOCLASE] * * *       any member of a continuous series of feldspar… …   Universalium

  • anorthoclase — an·or·tho·clase …   English syllables

  • anorthoclase — əˈnȯrthəˌklās, āz noun ( s) Etymology: International Scientific Vocabulary an + orthoclase; originally formed as German anorthoklase : a feldspar of chiefly sodium potassium aluminum silicate that is closely related to orthoclase but triclinic …   Useful english dictionary

  • feldspar — /feld spahr , fel /, n. any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks. Also, felspar.… …   Universalium

  • Mont Erebus — Pour les articles homonymes, voir Erebus. Mont Erebus Le mont Erebus vu depuis la péninsule de Hut Point …   Wikipédia en Français

  • Mount Erebus — Mt. Erebus Mount Erebus, 1972 Elevation 3,794 m (12,448 ft)  …   Wikipedia

  • Trachyte — is an igneous, volcanic rock with an aphanitic to porphyritic texture. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present. (See the QAPF… …   Wikipedia

  • Nepheline syenite — of the Intrusive Complex of Tanguá, State of Rio de Janeiro, Brasil (Motoki et al., 2011a) Nephelene syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar. The rocks are mostly pale colored, grey or… …   Wikipedia

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