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Ekmanite & Knebelite

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PJM167432

Ekmanite & Knebelite

Description Tabs

Description
Locality: 
Brunnsjögruvan, Grythyttan, Hällefors, Örebro County, Sweden
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2.7 × 2 cm
Description

A mass of fibrous dak brown to black stilpnomelane variety ekmannite with vitrous black knebelite

Mineral Data
What's on the rock

Ekmanite

Variety Of: 

Stilpnomelane

Formula: 
(K,Ca,Na)(Fe2+,Mg,Al,Fe3+)8(Si,Al)12(O,OH)36·nH2O
Strunz: 
9.EG.40
Hardness: 
3.0 - 4.0
Formula: 
(Fe2+,Mg,Mn,Fe3+)3(Si,Al)4O10(OH)2·2H2O
Crystal System: 
Orthorhombic
Hardness: 
0.0

Knebelite

Formula: 
from (Fe1.5Mn0.5)2SiO4 to (Mn1.5Fe0.5)2SiO4
Hardness: 
0.0
Earthstones Australia

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