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Anthophyllite & Phlogopite

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RBR152061

Anthophyllite & Phlogopite

Classic Locality

Description Tabs

Description
Locality: 
Heřmanov, Křižanov, Žďár nad Sázavou, Vysočina Region, Czech Republic
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.5 × 6.5 × 5.5 cm
Description

This is a so called "Hermanov-ball", a kind of specimen that was only found on one place in the world. The center is a ball of dark phlogopite surrounded by lighter anthophyllite. The area is protected, digging is now allowed anymore. This specimen shows the best quality and is undamaged. The Phlogopite-ball is 5,5 cm in diameter, very good visible and easy to display in various positions. This kind of specimen belongs to the european rarities.

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