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Glauconite

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RBR120742

Glauconite

Rare Mineral

Description Tabs

Description
Locality: 
Juda, Green County, Wisconsin, United States of America
Size Range: 
Cabinet (10-18 cm)
Size: 
12.5 × 7 × 5 cm
Description

This specimen is in fact glauconite sand grains embedded in calcite. Very rare and uncommon material from a small agricultural town south of Madison, Wisconsin. Ex Dallinger coll.

Mineral Data
What's on the rock

Glauconite

Formula: 
(K,Na)(Fe3+,Al,Mg)2(Si,Al,Fe3+)4O10)(OH)2
Hardness: 
2.0
Streak: 
None