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Bertrandite Muscovite & Albite

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SER167695

Bertrandite Muscovite & Albite

Description Tabs

Description
Locality: 
Conselheiro Pena, Minas Gerais, Brazil
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 6.5 × 4 cm
Description

Numerous tiny, colourless betrandite crystals on muscovite and albite .

Mineral Data
What's on the rock

Bertrandite

Formula: 
Be4(Si2O7)(OH)2
Strunz: 
9.BD.05
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 7.0
Type Locality: 
Petit-Port, Nantes, Loire-Atlantique, Pays de Loire, France

Muscovite

Formula: 
KAl2(AlSi3O10)(OH)2
Strunz: 
9.EC.15
Hardness: 
2.5
Streak: 
White

Albite

Formula: 
NaAlSi3O8
Strunz: 
9.FA.35
Crystal System: 
Triclinic
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Finnbo (Finbo), Falun, Dalarna, Sweden