20 pieces of Mica,  Squares, 0.15 mm (0.006")  thickness, size 15 mm x 15 mm. Each piece is separated from each other by paper.

Specific Gravity (water = 1.0): 2.7
Chemical Formula: K₂O·Al₂O₃·SiO₂
Hardness on Mohs scale of hardness: 2 - 2.25

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