Gypsum

  
Origin: Gibralter Mine (incl. "Cave of Swords"), Naica, Mun. de Saucillo, Chihuahua, Mexico
Ex. Scott Williams collection
Sample size: 7.1 x 3.2 x 4.5 cm
 
  
Origin: Fuentes de Ebro, Zaragoza, Aragón, Spain
Ex. Scott Williams collection
Sample size: 6.4 x 4.1 x 3.2 cm
 
  
Origin: Red River Floodway, Winnipeg, Manitoba, Canada
Sample size: 6.8 x 4.3 x 2 cm
 
  
  
Origin: Eisleben, Saxony, Germany
Sample size: 16.1 x 10.1 x 5.4 cm
 
  
This specimen formed in two generations as an evaporate from a pool of gypsum-rich water that was run-off from sedimentary bedrock - first, as yellow crystals, and later, as superimposed orange ones.
Origin: Whyalla Norrie, South Australia, Australia
Sample size: 10.8 x 7.4 x 4.9 cm
 

Photo courtesy of: 

Dan Weinrich

Dealer in fine mineral specimens

 

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