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Bannisterite

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CAM85861

Bannisterite

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Description
Locality: 
Broken Hill, New South Wales, Australia
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 2.5 × 0.8 cm
Description

A rich coverage of brownish-black plates of bannisterite, a uncommon and complex silicate, on a small amount of matrix. Associated with some minor orange-red rhodonite.

Mineral Data
What's on the rock

Bannisterite

Formula: 
Ca0.5(K,Na)0.5(Mn,Fe,Zn)10(Si,Al)16O38(OH)8·5.5H2O
Strunz: 
9.EG.75
Crystal System: 
Monoclinic
Hardness: 
4.0
Type Locality: 
Benallt Mine (Tyddyn Meirion mine; Ty Canol mine), Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd (Caernarvonshire), Wales, UK
Cartils Minerals

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