Name:
 Celestine		 Origin of name:
from the Latin caelestis...celestial, referring to the sky-blue colour		 Chemical formula:
SrSO4
Celestine, strontium sulphate, occurs as a sedimentary deposit, associated with rock-salt, gypsum and clay.

Celestine is the most common strontium mineral and the main ore. Strontium compounds burn with a crimson flame and are used in the manufacture of flares, fuses and fireworks; they are also used in manufacture of plastics and paints.

Crystal system:
orthorhombic
Class:
Sulphates
Hardness:
3 - 3.5
Cleavage:
perfect in one direction, less so in another direction.
Colour:
usually blue or colorless, sometimes brownish shades
Specific gravity:
3.96 - 3.98

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