Manganite

  

 

  

 

  

Origin: Wessels Mine, Kalahari Manganese Fields, South Africa

Ex. Charlie Key collection

Sample size: 4.5 x 2.2 x 1.2 cm (top), 4.3 x 4.0 x 2.5 cm (2nd/3rd row), 6.1 x 6.0 x 3.7 cm (bottom)

 

  

 

  

Manganite on quartz

Origin: Ilfeld, Harz Mountains, Germany

Sample size: 5.2 x 4.1 x 2.7 cm (top/2nd row), 6.0 x 5.5 x 4.2 cm (bottom)

 

Manganese nodule

Origin: deep-sea vent, Mid-Atlantic Ridge, Atlantic Ocean

Ex. Martin Zinn collection

Sample size: 6.4 x 5.5 x 5.1 cm

 

Origin: Ilfeld, Harz Mountains, Germany

Ex. Martin Zinn collection

Sample size: 4.8 x 1.3 x 1 cm

 

  

Manganite with a little yellow spot of probably ettringite

Origin: N''Chwaning Mine, near Kuruman, South Africa

Ex. W. Israel collection

Sample size: 4.1 x 2.2 x 0.9 cm

 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

Photo courtesy of: