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Manganogrunerite

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PJM45650

Manganogrunerite

Description Tabs

Description
Locality: 
Junction Mine, Block 14 opencut, Broken Hill, Yancowinna County, New South Wales, Australia
Size Range: 
Miniature (4.5-7 cm)
Size: 
1 × 4.5 × 2.1 cm
Description

Deep yellowish brown group of fibrous dannemorite from the Junction Mine, analysis has shown much of the early dannemorite is actually a mixtute of dannemorite, cummingtonite and grunerite. I believe this is the most correct description for this specimen of one of the rarer amphiboles.

Mineral Data
What's on the rock

Manganogrunerite

Formula: 
☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2
Strunz: 
9.DE.05
Crystal System: 
Monoclinic
Hardness: 
5.0 - 6.0
Colour: 
nd
Streak: 
nd
Type Locality: 
Dannemora mine, Dannemora, Östhammar, Uppland, Sweden
Earthstones Australia

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