Troilite

Grey-brown tarnished to bronze-brown massive troilite
Origin: N.E. of Crescent city, Del Norte County, California, U.S.A.
Sample size: 3 x 3 cm
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

Origin: Union mine, Del Norte, California, United States (type terrestrial locality)
Sample size: 7.5 x 4.5 x 4 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

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