Plagioclase meaning

plājēōklās
Any of a series of triclinic feldspars, ranging in composition from albite to anorthite and found in many rocks.
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Any of a series of common feldspar minerals, consisting of differing mixtures of sodium and calcium aluminum silicates. Plagioclase is typically white, yellow, or reddish-gray, but it can also be blue to black. It occurs in igneous rocks. The minerals albite, oligoclase, andesine, labradorite, bytownite, and anorthite are all plagioclases. Chemical formula: (Na,Ca)Al(Si,Al)Si2O8.
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(mineralogy) Any of a group of aluminum silicate feldspathic minerals ranging in their ratio of calcium to sodium.
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Origin of plagioclase

  • From plagio- +"Ž -clase, after German Plagioklas.

    From Wiktionary