Todorokite

Dark-brown crystalline coatings on colemanite
Origin: Corkscrew Mine, Death Valley, California, U.S.A.
Sample size: 1.5 x 3 cm, 2 x 3.5 cm, 3.5 x 3.5 cm
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

        
Black, lath-like and blocky crystals of todorokite included in and embedded on water-clear gypsum cleavage specimen
Origin: Nchwaning II Mine, Kalahari Manganese Field, South Africa
Sample size: 4.0 x 2.0 x 1.5 cm
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

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