Macfallite

  
Origin: Copper Harbor, Lake Manganese, Keeweenaw Co., Michigan, U.S.A.
Sample size: 6 x 5 x 3 cm with coppery dark red grains in matrix
 
  
Red-brown acicular macfallite in radial sprays to less than 2 mm in diameter embedded in matrix. Associated with black-brown orientite.
Origin: Manganese Mine, Keweenaw Co., Michigan, United States
Ex. Polak collection
Sample size: 4 x 3.5 x 3.5 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

Reddish-brown radiating aggregates ± orientite replacing calcite
Origin: Manganese Exploration, Copper Harbor, Keweenaw Co., Michigan, USA (type locality)
Sample size: microphoto
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

Origin: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, U.S.A. (type locality)
Ex. Martin Zinn collection
Sample size: 4 x 2.3 x 2.1 cm
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

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