Muscovite
Chemical Formula	KAl2(AlSi3O10)(F,OH)2
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	2
Specific Gravity	2.76-3
Color	White, grey, silvery
Streak	White
Luster	Vitreous, Silky, Pearly
Refractive Index	n = 1.552 - 1.576 n = 1.582 - 1.615 n = 1.587 - 1.618
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on .
Fracture	Micaceous
Crystal Habit：massive to platy
Geological Setting：Muscovite is common in many different rock types as a primary mineral.