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Stokesite Stannomicrolite & Cassiterite

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SER130489

Stokesite Stannomicrolite & Cassiterite

Description Tabs

Description
Locality: 
Urucum Mine, Galileia, Minas Gerais, Brazil
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 7 × 6 cm
Largest Crystal: 
1.10cm
Description

A large item of cleavelandite full of white balls of stokesite, tiny yellow stannomicrolite and one lustrous black cassiterite crystal

Mineral Data
What's on the rock

Stokesite

Formula: 
CaSn[Si3O9]·2H2O
Strunz: 
9.DM.05
Hardness: 
6.0
Streak: 
White
Type Locality: 
Stamps and Jowl Zawn (Roscommon Cliff), Cliff outcrops, Botallack, St Just, St Just District, Cornwall, England, UK

Stannomicrolite

Variety Of: 

Stannomicrolite (of Hogarth 1977)

Formula: 
(Sn,Fe,Mn)2(Ta,Nb,Sn)2(O,OH)7
Strunz: 
4.DH.15
Hardness: 
4.5 - 5.5

Cassiterite

Formula: 
SnO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal
Hardness: 
6.0 - 7.0