Orientite

  
Origin: Copper Harbor, Lake Manganese, Keeweenaw Co., Michigan, U.S.A.
Sample size: 7 x 4 x 3 cm with pink, powdery grains
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

  
  
Orientite with calcite, manganite and braunite
Origin: Manganese Mine, Keweenaw Co., Michigan, U.S.A.
Sample size: 6.8 x 5.4 x 4.6 cm
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

Light brown crystals on manganese ore matrix
Origin: Manganese Mine, Copper Harbour, Keweenaw Co., Michigan, U.S.A.
Sample size: micromount
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

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