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Natrodufrénite Roscherite & Elbaite

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SER920926

Natrodufrénite Roscherite & Elbaite

Description Tabs

Description
Locality: 
Ponte do Piauí Claim, Piauí Valley, Taquaral, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 6.5 × 3.5 cm
Description

a large albite matrix hosting a cluster of green natrodufrenite balls and tufts, several light yellow roscherite crystals and some blue green elbaite crystals ; purchased in Taquaral on 2010

Mineral Data
What's on the rock

Natrodufrénite

Formula: 
NaFe2+Fe3+5(PO4)4(OH)6·2H2O
Strunz: 
8.DK.15
Hardness: 
3.5 - 4.5
Type Locality: 
Pluherlin Castle, Rochefort-en-Terre, Morbihan, Brittany, France

Roscherite

Formula: 
Ca2Mn2+5Be4(PO4)6(OH)4·6H2O
Strunz: 
8.DA.10
Crystal System: 
Monoclinic Tabular crystals or platy aggregates
Hardness: 
4.5 - 0.0
Streak: 
White
Type Locality: 
Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany

Elbaite

Formula: 
Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Hardness: 
7.5
Streak: 
White
Type Locality: 
Fonte del Prete, San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy...