Muscovite

KAl2(Si3Al)O10(OH,F)2

Cleavage: [001] Perfect
Color: White, Gray, Silver white, Brownish white, Greenish white.
Density: 2.77 - 2.88, Average = 2.82
Diaphaniety: Transparent to translucent
Fracture: Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.
Habits: Massive - Lamellar - Distinctly foliated fine-grained forms.,
Foliated - Two dimensional platy forms.,
Micaceous - Platy texture with "flexible" plates.
Hardness: 2-2.5 - Gypsum-Finger Nail
Luminescence: None.
Luster: Vitreous (Glassy)
Streak: white