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Dumortierite

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RFJ840430

Dumortierite

Description Tabs

Description
Locality: 
Nasu-roseki Mine, Tochigi Prefecture, Honshu Island, Japan
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.7 × 5.4 × 3.7 cm
Description

Dumortierite- (blue) is in  massive Pyrophyllite,there are some small green -grey spots which are Magnesio-foitite,its all massive no crystals.

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...

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