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Cummingtonite

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CLB181140

Cummingtonite

Description Tabs

Description
Locality: 
Stollberg Mine, Väster Silvberg, Smedjebacken, Dalarna County, Sweden
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.4 × 3.3 × 2.2 cm
Description

Good sample of black, shiny cummingtonite. Far more lustrous in nature.

Mineral Data
What's on the rock

Cummingtonite

Formula: 
☐{Mg2}{Mg5}(Si8O22)(OH)2
Strunz: 
9.DE.05
Crystal System: 
Monoclinic
Hardness: 
5.0 - 6.0
Streak: 
nd

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