Number 13

Color--------------------White, clear

Luster------------------Nonmetallic, vitreous

Streak------------------White

Hardness---------------3.0

Cleavage/--------------Cleavage, perftect in 3 directions
Fracture                    rhombohedral

S.G.---------------------2.7

Special Properties------Fizzes in HCl.

Formula-----------------CaCO3

Mineral name------------Calcite

Family-------------------Carbonates

Uses--------------------Manufacturing of glass

Calcite