Opal

  
Opalized mollusc
Origin: Coober Pedy, South Australia, Australia
Ex. Hauck collection
Sample size: 4.1 x 2.8 x 1.8 cm
 
  
 
Opalized ammonite
Origin: Mujunga, Madagascar
Sample size: 4.5 x 3.8 x 1.3 cm (top), 3.3 x 2.6 x 1.1 cm (bottom)
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

     
     
Opal limb cast
Origin: Lightning Ridge, New South Wales, Australia
Ex. Keith Hayes collection
Sample size: 1.5 x 1.1 x 0.5 cm
 
  
  
Very fluorescent, large piece of feldspar covered with shallow blobs of hyalite opal. This opal fluoresces a hot green under short wave UV. The camera couldn't quite focus, but you can see that it glows very nicely.
Origin: Spruce Pine, Mitchell County, North Carolina, U.S.A.
Ex. Keith Hayes collection
Sample size: 29.5 x 16.6 x 4.1 cm
 

Photo courtesy of: 

John Veevaert, Trinity Mineral Co

Trinityminerals.com

 

Hyalite opal
Origin: Boral Limited quarry, Bundoora, Victoria, Australia
Sample size: field of view 4 mm
Sample owner: Keith and Margaret Brown
 
 

Photo courtesy of: 

Steve Sorrell

Crocoite.com

 

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