Color: usually colorless, white or gray, also yellow, bluish, reddish, greenish
Streak: Colorless
Luster: vitreous
Habit: Crystals tabular, also prismatic or equant, commonly twinned, massive, cleavable, granular or compact
Hardness: 6 to 6.5
Specific gravity: 2.62 to 2.76
Cleavage: 3; {001} perfect, {010} nearly perfect, {110} imperfect
Tenacity: Brittle
Twinning: Albite-law, polysyntetic twinning
Crystal system: triclinic
Crystal class: bar1
Unit cell:
Synonyms/varieties: there are six members of the plagioclase series defined by their contents of Na and Ca or An content: albite=An0, oligoclase=An20, andesine=An40, labradorite=An60, bytownite=An80 and anorthite100