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Glaucophane & Rutile

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PDM736594

Glaucophane & Rutile

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Description
Locality: 
Rio Oremo, Chiavolino, Pollone, Biella Province, Piedmont, Italy
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.7 × 3.5 × 2.1 cm
Description

Aggregate of short prismatic crystals of glaucophane with intense lustre and deep blue-black colour, from a classic Italian locality. It is associated to red rutile and green fuchsite.

Acquired in 2001 by Bob Janssens (BE), specimen #1180.

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

Rutile

Formula: 
TiO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal - Ditetragonal Dipyramidal
Hardness: 
6.0 - 6.5
Type Locality: 
Rutile locality, Horcajuelo de la Sierra, Madrid, Spain

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