Manganosite

  

Black manganosite crystals in pink sonolite with foliated zincite

A relavitely large, sharp crystal of manganosite with minor contrasting zincite

A relavitely large, sharp crystal of manganosite with minor contrasting zincite

Origin: Franklin Mine, Sussex County, New Jersey, U.S.A.

Sample size: 10 x 6 x 4.5 cm (top/2nd row), 3.7 x 2.9 x 2.4 cm (3rd row), 3.0 x 2.0 x 1.5 cm (bottom)

 

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Origin: Franklin, Sussex Co., New Jersey, U.S.A.

Sample size: 1.5 x 1 cm specimen of zincite (red) with rare manganosite (green) grains

 

  

This cabinet specimen has very large crystallized grains in excess of 1 cm - actually up to 1.3 cm across! This is larger than the book on Långban reported being found. Manganosite is a simple oxide of manganese which is deep green on fresh surfaces and then tend to alter to manganite, pyrochroite or some other form of manganese oxide. This specimen has matrix comprised of calcite which fluoresces under SW UV light. Though not a rare species at Långban the size of the grains is quite exceptional. Ex. Harry von Eckermann Collection

  

This specimen of calcite hosts abundant grains of hausmannite and scattered grains of deep green manganosite. Most of the surface manganosite has oxidized to a deep black though one area protected still reveals the deep green color.  Ex. Frank Edwards Collection

Origin: Långban, Sweden

Sample size: 8.5 x 7.5 x 4.2 cm (top/2nd row), 7.7 x 4 x 2 cm (3rd/bottom row)

 

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Origin: Nordmark, Filipstad, Värmland, Sweden

Picture size: 3.5 mm

Owner: Thomas Witzke

 

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Black octahedral crystals on matrix

Origin: Nordmark, Värmland, Sweden

Sample size: 2 x 3 cm

 

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