Colemanite

     

Colemanite with creamy-yellow calcite. Ground water flowing through the borax sediments at the bottom of the playa is believed to react with the borax and form colemanite as a secondary mineral.

Origin: near Boron, California, U.S.A.

Sample size: 7.7 x 7.4 x 5.4 cm

 

  

Origin: Boraxo Pit #1, Ryan Dist., Death Valley, California, U.S.A.

Sample size: 8.3 x 6.2 x 6.0 cm

 

  

Twinned colemanite

Origin: Mustafakemalpascha Mine , Western Anatolia Prov., Turkey

Sample size: 5.5 x 5.1 x 4.4 cm

 

  

Origin: Thompson Mine, Death Valley, Inyo Co., California, U.S.A.

Ex. Charlie Freed collection

Sample size: 3.4 x 1.9 x 1.8 cm

 

  

Origin: Boron, Kern County, California

Ex. Ed Ruggiero collection

Sample size: 7.0 x 5.2 x 4.0 cm

 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

  

Colemanite with realgar

Origin: Boron, Inyo Co., California, United States

Ex. DeVito collection

Sample size: 5 x 4 x 3 cm

 

  

Colemanite with small amounts of orange microcrystalline realgar

Origin: Boron, Kern Co., California, United States

Sample size: 6 x 3.5 x 4cm

 

Photo courtesy of: 

 

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