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Phlogopite Anthophyllite

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GPM653440

Phlogopite Anthophyllite

Description Tabs

Description
Locality: 
Heřmanov, Vysočina Region, Moravia, Czech Republic
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.2 × 4.4 × 2.7 cm
Description

So-called "Heřmanov sphere". A spherical aggregate of brownish coarse-grained phlogopite with cream coloured fibrous anthophyllite rim.

499

Mineral Data
What's on the rock

Phlogopite

Formula: 
KMg3(AlSi3O10)(OH,F)2
Strunz: 
9.EC.20
Crystal System: 
Monoclinic - Prismatic
Hardness: 
2.0 - 3.0
Streak: 
White

Anthophyllite

Formula: 
☐{Mg2}{Mg5}(Si8O22)(OH)2
Strunz: 
9.DE.05
Crystal System: 
Orthorhombic - Dipyramidal
Hardness: 
5.5 - 6.0
Type Locality: 
Kjennerudvann Anthophyllite Prospect, Kjennerudvann, Kongsberg, Buskerud, Norway

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