Gypsum

  

  

  

 

  

  

 

  

 

  

  

 

  

Selenite twins

Origin: Red River Floodway, nr. Winnipeg, Manitoba, Canada

Ex. Marty Lewadny collection

Sample size: 7 x 7 x 3.5 cm (top/2nd row), 6.5 x 4 x 4.2 cm (3rd/4th row), 3.8 x 2.8 x 2.7 cm (5th/6th row), 4.3 x 3.2 x 2.4 cm (7th/8th row), 5 x 4.5 x 2.5 cm (9th/10th row), 9 x 7 x 6 cm (11th/bottom row)

 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

Origin: Sahara Desert, Algeria

Sample size: 3 x 3 x 3 cm

 

Photo courtesy of: