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 good cleavage surfaces.
更多plagioclase例句
The rock—which also contains the plain-old mineral plagioclase—includes pink spinel, a prized jewel on Earth.
The felted or hyalopilitic texture is the most common, and plagioclase is the principal groundmass constituent.
There is also some variation in the amount of quartz present, and in the relative importance of the orthoclase and plagioclase.
Vogesites contain hornblende and orthoclase; spessartites, hornblende and plagioclase.
Minettes contain biotite and orthoclase; kersantites, biotite and plagioclase.
Essentially it is a crystalline-granular compound of plagioclase, generally Labradorite and diallage.