plagioclase

Noun

Meaning

A general term used of any triclinic feldspar. See the Note under Feldspar.

Source: Webster's dictionary

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Examples

Albite is considered both a plagioclase and alkali feldspar. Source: Internet

Note white plagioclase "microlites" in cross-polarized light picture, surrounded by very fine grained volcanic glass. Source: Internet

Feldspar can be divided into two smaller subdivisions: alkali feldspars and plagioclase feldspars. Source: Internet

Gabbro is usually equigranular in texture, although it may be porphyritic at times, especially when plagioclase oikocrysts have grown earlier than the groundmass minerals. Source: Internet

If the sandstone is dominantly plagioclase, then it is igneous in origin. Source: Internet

Intermediate members The intermediate members of the plagioclase group are very similar to each other and normally cannot be distinguished except by their optical properties. Source: Internet

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