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Pumpellyite-(Mg)

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GMN720364

Pumpellyite-(Mg)

Description Tabs

Description
Locality: 
Obří důl, Krkonoše Mountains, Hradec Králové Region, Czech Republic
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2.8 × 2 cm
Description

Greyish-green sprays of acicular crystals.

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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