Number 33

Color--------------------Colorless with shades of light blue.

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

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

Hardness--------------3.0 - 3.5

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

S.G.---------------------3.9 - 4.0

Special Properties---Has a good rhombohedral cleavage.

Formula-----------------Sr(SO4)

Mineral Name---------Celestite

Family-------------------Sulfates

Uses---------------------Manufacture specialized glass.

Celestite