Mica, Squares, 0.15 mm (0.006") thickness, size 15 mm x 15 mm (Package of 20 pieces) 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