anorthite

anorthite
A plagioclase feldspar, the final member of the Albite-Anorthite solid solution series. Anorthite is very rare on Earth, but abundant in moon rocks. This is because Anorthite weathers rapidly to clay minerals under atmospheric conditions. Good crystals have been found in lava-digested limestone blocks erupted from Mount Vesuvius. ,Chemical composition: Calcium aluminum silicate, ,Physical properties: Mohs Hardness: 6.0 Specific gravity: 2.76 Color: Shades of gray, often with a blue, purple, or green cast Luster: glassy Fracture: conchoidal Cleavage: two good at about 94º to each other Habit: Triclinic - pinacoidal. Crystals are well developed, forming massive clumps, and are both twinned and striated.

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  • Anorthite — Anorthite[1] Catégorie IX : silicates[2] …   Wikipédia en Français

  • anorthite — ● anorthite nom féminin (allemand Anorthit, du grec orthos, droit) Minéral constituant le pôle calcique de la série des plagioclases (CaAl2Si2O8), triclinique. ⇒ANORTHITE, subst. fém. MINÉR. Silicate d aluminium et de calcium, appartenant à la… …   Encyclopédie Universelle

  • Anorthite — A*nor thite, n. [Gr. an priv. + ? straight (? sc. ? right angle); not in a right angle.] A mineral of the feldspar family, commonly occurring in small glassy crystals, also a constituent of some igneous rocks. It is a lime feldspar. See… …   The Collaborative International Dictionary of English

  • anorthite — [an ôr′thīt΄] n. [< Gr an , not + orthos, straight (see ORTHO ) + ITE1] a white or grayish variety of plagioclase, CaAl2Si2O8, found in basic igneous rocks anorthitic [an ôr′thit′ik] adj …   English World dictionary

  • Anorthite — Infobox mineral name = Anorthite category = Feldspar mineral boxwidth = boxbgcolor = imagesize = caption = Anorthite from Japan formula = CaAl2Si2O8 molweight = color = White, grayish, reddish habit = Anhedral to subhedral granular system =… …   Wikipedia

  • anorthite — anorthitic /an awr thit ik/, adj. /an awr thuyt/, n. Mineral. a white or gray feldspar mineral, CaAl2Si2O8, calcic plagioclase. [1825 35; AN 1 + ORTH + ITE1] * * * Feldspar mineral, calcium aluminosilicate (CaAl2Si2O8), that occurs as white or… …   Universalium

  • anorthite — anortitas statusas T sritis chemija apibrėžtis Mineralas. formulė Ca[Al₂Si₂O₈] atitikmenys: angl. anorthite rus. анортит …   Chemijos terminų aiškinamasis žodynas

  • anorthite-basalt — noun : a rock consisting of a basic variety of basalt with anorthite instead of labradorite …   Useful english dictionary

  • anorthite — noun Etymology: French, from a + Greek orthos straight Date: 1833 a white, grayish, or reddish feldspar occurring in many igneous rocks • anorthitic adjective …   New Collegiate Dictionary

  • anorthite — [ə nɔ:θʌɪt] noun a calcium rich mineral of the feldspar group, typically white. Origin C19: from an 1 + Gk orthos straight + ite1 …   English new terms dictionary

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