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Boracite

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PDM621559

Boracite

Description Tabs

Description
Locality: 
Gröna Mine, Bernburg, Stassfurt, Saxony - Anhalt, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 2.1 × 2 cm
Description

Transparent light-blue grey boracite crystals on a matrix of grey anhydrite and orange halite. The main crystal form is the pseudo-tetrahedron {111}, modified by pseudo-rhombododecahedral {110} faces at the corners, and {100} faces at the edges. Unusually it is twinned, what is very rare. Luster is high and they are completely free of damage. A great miniature!.

Mineral Data
What's on the rock

Boracite

Formula: 
Mg3(B7O13)Cl
Strunz: 
6.GA.05
Crystal System: 
Orthorhombic
Hardness: 
7.0 - 7.5
Streak: 
White
Type Locality: 
Lüneburger Kalkberg, Lüneburg, Lower Saxony, Germany

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