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Coutinhoite

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Coutinhoite

Description Tabs

Description
Locality: 
Urucum Mine, Galileia, Minas Gerais, Brazil
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 3 × 0.7 cm
Description

Massive coutinhoite on mica. Rare uranium silicate. Type locality!

References:

American Mineralogist (2004): 89(5-6): 721-724.

 

Mineral Data
What's on the rock

Coutinhoite

Formula: 
ThxBa(1-2x)(UO2)2Si5O13·(H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))
Strunz: 
9.AK.30
Hardness: 
2.0 - 0.0
Colour: 
yellow
Streak: 
yellow
Type Locality: 
Urucum mine (Tim mine; Córrego do Urucum pegmatite), Galiléia, Doce valley, Minas Gerais, Brazil