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Mineral Properties and Uses

Physical Properties of Glauconite

Chemical Classification silicate
Color green, blue green
Streak dull green
Luster earthy to dull
Diaphaneity transparent to translucent
Cleavage perfect
Mohs Hardness 2
Specific Gravity 2.4 to 3.0
Diagnostic Properties color
Chemical Composition (K,Na)(Fe3+,Al,Mg)2((Si,Al)4O10)(OH)2
Crystal System monoclinic
Uses fertilizer, soil amendment

Glauconite in sandstone
This is glauconite in sandstone from Afton, Minnesota. Specimen is approximately 3-1/2 inches (8.9 centimeters) across.

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Glauconite, or greensand, from Birmingham, New Jersey. These specimens are small particles 1 to 2 millimeters across.

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