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Bannisterite

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JYJ500109

Bannisterite

Description Tabs

Description
Locality: 
Prakovce, Gelnica County, Košice Region, Slovakia (Slovak Republic)
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.8 × 2.8 × 2.7 cm
Description

Bannisterite, a structurally related mineral to stilpnomelane, is described only from a few localities. On this specimen bannisterite is present as elongated brown crystals.

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