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Pumpellyite-(Mg)

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CFL687107

Pumpellyite-(Mg)

Description Tabs

Description
Locality: 
Copper Falls, Keweenaw County, Michigan, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.8 × 1.2 × 1 cm
Weight: 
20.00gr
Description

Typical specimen of dark green acicular pumpellyite-(Mg) crystals on matrix.

Mineral Data
What's on the rock

Pumpellyite-(Mg)

Formula: 
Ca2MgAl2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Crystal System: 
Monoclinic
Hardness: 
5.5
Streak: 
White
Type Locality: 
Keweenaw Co., Michigan, USA

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