Albite

NaAlSi3O8

Cleavage: [001] Perfect, [010] Good
Color: White, Gray, Greenish gray, Bluish green, Gray.
Density: 2.61 - 2.63, Average = 2.62
Diaphaniety: Transparent to translucent to subtranslucent
Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habits: Blocky - Crystal shape tends to be equant (e.g. feldspars),
Striated - Parallel lines on crystal surface or cleavage face.,
Granular -Generally occurs as anhedral to subhedral cryst als in matrix.
Hardness: 7 - Quartz
Luminescence: None.
Luster: Vitreous (Glassy)
Streak: white