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Anthophyllite & Phlogopite

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MNR44883

Anthophyllite & Phlogopite

Hermanov Sphere
Classic Locality

Description Tabs

Description
Locality: 
Heřmanov, Křižanov, Žďár nad Sázavou, Vysočina Region, Czech Republic
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 5 × 3.7 cm
Description

Interesting mineral composition called "Hermanovska koule" = Hermanov sphere based on the place where it is found. It's actually anthophyllite with phlogopite concretion.

Cream coloured fibrous are anthophyllite and brown crystals are phlogopite. Phlogopite is primarily the core of the specimen and the top layer. Aesthetic sample.

Mineral Data
What's on the rock

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

Phlogopite

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