Mineral Name

Plagioclase

Chemical Formula

NaAlSi3O8 CaAl2Si2O8

Creator

Preview

Color

colorless, white, gray, rarely greenish

Class

Article

Luster

vitreous to pearly

Diaphaneity

transparent to translucent

Hardness

6

Cleavage

2 directions: {001} perfect, {010} good

Fracture

uneven

Density

2.6 - 2.7

Crystal Shape

distinct crystals rare, usually as cleavage fragments

Crystal System

Triclinic

Comments

may be striations in one direction

Streaming Media