PLAGIOCLASE

Plagioclase

Plagioclase is an important series of tectosilicate minerals within the feldspar family. Rather than referring to a particular mineral with a specific chemical composition, plagioclase is a solid solution series, more properly known as the plagioclase feldspar series . This was first shown by the German mineralogist Johann Friedrich Christian Hessel in 1826. The series ranges from albite to anorthite endmembers, where sodium and calcium atoms can substitute for each other in the mineral's crystal lattice structure. Plagioclase in hand samples is often identified by its polysynthetic twinning or 'record-groove' effect.

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plagioclase

Noun

  1. Any of a group of aluminum silicate feldspathic minerals ranging in their ratio of calcium to sodium.


The above text is a snippet from Wiktionary: plagioclase
and as such is available under the Creative Commons Attribution/Share-Alike License.

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