Mica, Disks, 0.15 mm (0.006")  thickness,  size  9.5 mm diameter (Package of 20 pieces) 20 pieces of Mica, Disks, 0.15 mm (0.006")  thickness,  size  9.5 mm diameter. Each piece is separated from eah other by paper.
Specific Gravity (water = 1.0): 2.7
Chemical Formula: K₂O·Al₂O₃·SiO₂
Hardness on Mohs scale of hardness: 2 - 2.25