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Dumortierite

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PDM1013647

Dumortierite

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Description
Locality: 
Soavina, Ambatofinandrahana, Amoron'i Mania, Madagascar
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.2 × 4 × 2.8 cm
Weight: 
77.00gr
Description

A metamorphic rock composed almost exclusively by blue fibrous dumortierite from Soavina (Madagascar). Specimen from the collection of Wilfred Moorer (#1764), who traded it with Noorman in 1972.

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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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