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Glaucophane

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PDM787469

Glaucophane

Description Tabs

Description
Locality: 
Rio Oremo, Chiavolino, Pollone, Biella Province, Piedmont, Italy
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.2 × 3 × 1.3 cm
Description

Hundreds of interbedded, short prismatic crystals of glaucophane with intense lustre and deep blue-black colour.

Acquired in 2001 by Bob Janssens (BE), specimen #1181.

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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