Hydroxylherderite

  

  

 

  

This specimen of albite, muscovite and cookeite has several crystals of hydroxylherderite to 2 cm in length.

Origin: Divino das Laranjeiras, Linopolis, Minas Gerais, Brazil

Sample size: 7.3 x 6.5 x 3.5 cm (top/2nd/3rd row), 7.3 x 4.5 x 3.5 cm (4th/bottom row)

 

  

 

  

Hydroxylherderite twins

  

This specimen consists of twinned and fully terminated crystals hydroxylherdite. The crystals share a termination and have a thin alteration rind. Despite the alteration the crystals have bright luster.

  

Origin: Corrego Frio Mine, Linopolis, Minas Gerais, Brazil

Sample size: 4.1 x 2.7 x 2.3 cm (top/2nd row), 4.5 x 2.5 x 2.3 cm (3rd/4th row), 3.6 x 2 x 1.7 cm (5th row), 4.5 x 3.4 x 2 cm (bottom)

 

Photo courtesy of: 

Trinityminerals.com

 

  

 

  

Origin: Pomarolli mine, Divino das Laranjeiras, Minas Gerais, Brazil

Sample size: 10 x 6 x 4 cm (top), 3 x 3 x 2 cm (bottom)

 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

  

Hydroxyl-herderite with muscovite on albite

  

Hydroxyl-herderite on columnar muscovite

  

Origin: Barra das Salinas, Coronel Murta, Minas Gerais, Brazil

Sample size: 5.0 x 4.8 x 3.9 cm (top/2nd row), 5.7 x 3.1 x 3.0 cm (3rd row), 3.4 x 2.2 x 1.7 cm (bottom)

 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

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