plagioclase series

plagioclase series

The plagioclase series
mineral     percent albite     percent anorthite
albite 100–90 0–10
oligoclase 90–70 10–30
andesine 70–50 30–50
labradorite 50–30 50–70
bytownite 30–10 70–90
anorthite 10–0 90–100
See as table:

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Universalium. 2010.

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  • 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 — plagioclastic /play jee euh klas tik/, adj. /play jee euh klays /, n. any of the feldspar minerals varying in composition from acidic albite, NaAlSi3O8, to basic anorthite, CaAl2Si2O8, found in most igneous rocks: shows twinning striations on… …   Universalium

  • plagioclase — [plā′jē ō klās΄] n. [Ger plagioklas < Gr plagios (see PLAGIO ) + klasis, a cleaving, fracture < klaein, to break: see CLASTIC] any of a series of triclinic feldspars, ranging in composition from albite to anorthite and found in many rocks …   English World dictionary

  • plagioclase — noun A group of feldspar minerals that form a solid solution series from albite (sodium aluminum silicate) to anorthite (calcium aluminum silicate). The plagioclase feldspars are found in igneous, plutonic, and metamorphic rocks. They all have… …   Wiktionary

  • plagioclase — n. a series of feldspar minerals forming glassy crystals. Etymology: PLAGIO + Gk klasis cleavage …   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

  • Feldspar — is the name of a group of rock forming minerals which make up as much as 60% of the Earth s crust.Feldspar. [http://www.ima industrial minerals/feldspar.asp What is Feldspar?] Industrial Minerals Association. Retrieved on July 18… …   Wikipedia

  • labradorite — labradoritic /lab reuh daw rit ik/, adj. /lab reuh daw ruyt , lab reuh dawr uyt/, n. a feldspar mineral of the plagioclase group, often characterized by a brilliant change of colors, with blue and green most common. [1805 15; named after LABRADOR …   Universalium

  • Labradorite — ((Ca,Na)(Al,Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. It is usually defined as having %An (anorthite) between 50 and 70. The specific gravity ranges from 2.71 to 2.74. The streak is white, like… …   Wikipedia

  • Andesine — is a feldspar mineral, a part of the plagioclase series.It is usually defined as having %An between 30 and 50.Density is about 2.68.See the plagioclase main article for more information …   Wikipedia

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