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Anthophyllite

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MGR900611

Anthophyllite

Classic Locality

Description Tabs

Description
Locality: 
Heřmanov, Křižanov, Žďár nad Sázavou, Vysočina Region, Czech Republic
Class: 
Combination
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.7 × 4.5 × 3.5 cm
Description

A superior and very well-defined example of the rare and classic nodules of anthophyllite from Hermanov. The outer layer is composed of silvery-golden "needle"-like crystals of the rare magnesium iron inosilicate hydroxide anthophyllite with a deep bronze-brown colored "core" of phlogopite mica. Old classic material, called "Hermanov balls".

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