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Cummingtonite

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PDM733344

Cummingtonite

Description Tabs

Description
Locality: 
Buckskin Mountains, Midway District, La Paz County, Arizona, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.7 × 3.3 × 2.9 cm
Description

Acicular yellow to green crystals of cummingtonite, (variety magnesio-cummingtonite) richly covering different cavities of a matrix of crystallized lustrous lenticular hematite.

Ex. Dr. Bob Janssens specimen, #1854.

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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