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Glaucophane

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PDM837382

Glaucophane

Classic Locality

Description Tabs

Description
Locality: 
Groix Island, Morbihan, Brittany, France
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.4 × 6.1 × 3.3 cm
Weight: 
91.00gr
Description

Aggregate of prismatic crystals of glaucophane with intense lustre and deep blue-black colour, from a classic French locality.

Acquired in 1980. Ex Georges Vanacker* Museum specimen, N° VIII/3/189.

*Vanackerite from Tsumeb was named after him.

Mineral Data
What's on the rock

Glaucophane

Formula: 
◻[Na2][Mg3Al2]Si8O22(OH)2
Strunz: 
9.DE.25
Hardness: 
5.0 - 6.0
Type Locality: 
Syros Island (Syra), Cyclade Islands (Cyclades; Kikladhes; Nomos Kikladhon), Kykládes Prefecture, Aegean Islands Department (Aiyaíon), Greece

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