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Staurolite

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MGR1033419

Staurolite

Classic Locality

Description Tabs

Description
Locality: 
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russian Federation
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.1 × 1.6 × 0.8 cm
Description

Here we have a fantastic matrix specimen from Russia. A reddish-brown cross of staurolite perfectly set in the center of the piece. What is special about this particular example is that the twinning of the crystals occures commonly as 60° twins but much less common as 90° cruciform twins, which this example does. The appearence is very eye-catching and esthetic.

Mineral Data
What's on the rock

Staurolite

Formula: 
Fe2+2Al9O6(SiO4)4(O,OH)2
Strunz: 
9.AF.30
Crystal System: 
‎Monoclinic
Hardness: 
7.0 - 7.5
Colour: 
Brown