Opal

  
Matrix coated by translucent colorless opal
  
Origin:  Mexico
Sample size: 8 x 11 x 5 cm (top), 4 x 5 x 2 cm (bottom)
 

  

Hyalite opal
Origin: Spruce Pine, North Carolina, U.S.A.
Sample size: 10 x 6.5 x 2.5 cm
 
Opalized clam shell
Origin: Lightning Ridge, Australia
Sample size: 3 x 3.5 x 1.5 cm
 
  
Transparent colorless bubbly botryoidal hyalite opal covering a 3 x 3.5 cm area on a chalcedony matrix.
Origin: Cerra de la Rosa de Castilla, Guanajuato, Mexico
Sample size: 8.5 x 7.5 x 5.5 cm
 

Photo courtesy of: 

Dan Weinrich

Dealer in fine mineral specimens

 

  
Origin: Rodriguez Dam, near Tijuana, Baja California Norte, Mexico
Sample size: 7.4 x 4.5 x 2.1 cm
 
  
Origin: Rodriguez Dam, near Tijuana, Baja California Norte, Mexico
Sample size: 3.9 x 3.4 x 2.4 cm
 
  
Opalized clams and gastropod
Origin: Coober Pedy, South Australia, Australia
Sample size: 7.4 x 7.3 x 3.6 cm
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

 
Globular or botryoidal aggregates of white to greenish yellow opal variety fiorite; the larger sample shows the coarse grained granitic hostrock
Origin: Castro Daire, Northern Portugal
Sample size: 6 x 10 cm (top), 3 x 3 cm (bottom)
 
Colourless to grey globular concretions on matrix
Origin: Nieder-Ofleiden, Homberg (Ohm), Hessen, Germany
Sample size: 5.5 x 7 cm

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

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