perthite

About 0.04 uses per million words.

Meaning

1. noun A laminated mixture of two feldspars: plagioclase and either orthoclase or microcline.

Similar words

microcline lamellae antiperthite microperthite plag porphyroid plagioclase periclasite phonolite lithiophosphate

Often followed by

and is in lamellae are from with granite grains