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Muscovite

Muscovite is a hydrated phyllosilicate mineral of aluminium and potassium with formula KAl₂(F, OH)₂, or (KF)₂(Al₂O₃)₃(SiO₂)₆. It has a highly perfect basal cleavage yielding remarkably thin laminae which are often highly elastic. Sheets of... Wikipedia
Birefringence: δ = 0.035 – 0.042
Cleavage: Perfect on the
Crystal habit: Massive to platy
Crystal system: Monoclinic
Fracture: Micaceous
Luster: Vitreous, silky, pearly
Mohs scale hardness: 2–2.5 parallel to; 4 right angle to