bytownite

bytownite
A plagioclase feldspar, the fifth member of the Albite-Anorthite solid solution series. Bytownite is rare, and normally occurs in small grains in lime-rich igneous rocks. Clear pale yellow crystals have come from Mexico and Oregon. ,Chemical composition: Calcium sodium aluminum silicate, ,Physical properties: Mohs Hardness: 6.0 Specific gravity: 2.74 Color: White, pale yellow, shades of gray Luster: glassy Fracture: conchoidal Cleavage: two good at about 94º to each other Habit: Triclinic - pinacoidal. Crystals are rare.

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  • Bytownite — is a calcium rich member of the plagioclase solid solution series of feldspar minerals. It is usually defined as having %An between 70 and 90. Like others of the series, bytownite forms grey to white triclinic crystals commonly exhibiting the… …   Wikipedia

  • bytownite — ● bytownite nom féminin (de Bytown, nom propre) Plagioclase très calcique, intermédiaire entre le labrador et l anorthite …   Encyclopédie Universelle

  • bytownite — ˈbī(ˌ)tau̇ˌnīt,  ̷ ̷ˈ ̷ ̷ˌ ̷ ̷ noun ( s) Etymology: Bytown (now Ottawa), Canada + English ite : a plagioclase feldspar consisting of 10 to 30 percent albite and 90 to 70 percent anorthite * * * bytownite Min. (ˈbaɪtaʊnaɪt) [f. Bytown, (now… …   Useful english dictionary

  • bytownite — /buy tow nuyt/, n. a blue to dark gray mineral near the anorthite end of the plagioclase feldspar group. [1865 70; named after Bytown (old name of Ottawa, Canada), where first found; see ITE1] * * * …   Universalium

  • bytownite — by·town·ite …   English syllables

  • Plagioclase — A photomicrograph of a plagioclase crystal under cross polarized light. The plagioclase crystal shows a distinct banding effect called a Polysynthetic twinning. (unknown scale) General Category …   Wikipedia

  • Plagioclase — Grains fins de plagioclases dans roche volcanique Les plagioclases sont une importante série de silicates minéraux dans la famille des feldspaths. Plutôt que de se référer à un minéral particulier avec une composition chimique spécifique, le… …   Wikipédia en Français

  • Bytownit — Dieser Artikel wurde aufgrund von formalen Mängeln an Gestaltung bzw. Form und/oder inhaltlichen Mängeln auf der Qualitätssicherungsseite des WikiProjekts Minerale eingetragen. Dies geschieht, um die Qualität der Artikel aus dem Themengebiet… …   Deutsch Wikipedia

  • List of minerals A-B (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

  • Puy de la Nugère — Le puy de la Nugère, flanc est (carrière de pouzzolane) Géographie Altitude 994 m …   Wikipédia en Français

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