Celestine

SrSO4

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Celestine (celestite) is the primary ore of strontium, named for its occasional celestial blue color. The world's largest geode, the Crystal Cave in Put-in-Bay, Ohio, is lined with celestine crystals up to 90 cm long.

Crystal System Orthorhombic
Mineral Class 07 Sulfates, Chromates, Molybdates, and Tungstates
Mohs Hardness 3.0-3.5
Specific Gravity 3.95-3.97
Color Colorless, pale blue, white, yellow
Luster Vitreous
Streak White
Cleavage Perfect {001}
Fracture Uneven
Transparency Transparent
Crystal Habit Tabular, prismatic

Mohs Hardness

Mohs Hardness: 3.0 – 3.5
1 Soft10 Hard

Crystal System

Orthorhombic

Frequently Asked Questions

What is the hardness of Celestine?
Celestine has a Mohs hardness of 3.0-3.5.
What crystal system does Celestine belong to?
Celestine crystallizes in the Orthorhombic crystal system.
What color is Celestine?
Celestine is typically Colorless, pale blue, white, yellow.
What type of luster does Celestine have?
Celestine exhibits a Vitreous luster.
What is the chemical formula of Celestine?
The chemical formula of Celestine is SrSO4.