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Dumortierite

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MGR596653

Dumortierite

Description Tabs

Description
Locality: 
Ditrău, Harghita County, Romania
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
10.3 × 7.8 × 2.1 cm
Description

Great rarity from an unusual locality. Dumortierite shows an intense blue color - fine contrast to white matrix. Well cut and polished, no backlight - this is natural color under daylight.

Mineral Data
What's on the rock

Dumortierite

Formula: 
(Al,Fe3+)7(SiO4)3(BO3)O3
Strunz: 
9.AJ.10
Crystal System: 
Orthorhombic
Hardness: 
7.0 - 8.0
Type Locality: 
Ducarre's Quarry, Beaunant, Chaponost, Rhône, Rhône-Alpes, France...