KAl₂(AlSi₃O₁₀)(OH)₂
Muscovite
Sheets of mica peel with a fingernail, potassium aluminium silicate, 2 to 2.5 on Mohs.
KAl₂(AlSi₃O₁₀)(OH)₂
Sheets of mica peel with a fingernail, potassium aluminium silicate, 2 to 2.5 on Mohs.
Muscovite is KAl₂(AlSi₃O₁₀)(OH)₂ before it is a story. The lattice is monoclinic, Mohs 2–2.5, and the eye meets white.
The better pieces still come out of the ground in Russia, India, Brazil. Sheets of mica peel with a fingernail, potassium aluminium silicate, 2 to 2.5 on Mohs.
The parlour tradition ties Muscovite to air and to the crown centre. The old site stood it near: Aquarius, Gemini.
Softer than a steel knife. No ultrasonic bath, no acid, no sudden heat. Dust wants a dry cloth.