Cassiterite

  
Ex. Edward E. David collection
  
  
  
Several sharp, highly lustrous, mirror bright, gemmy, brown cyclic twinned crystals measuring up to 1.4 cm with gemmy crystals of quartz and scattered tan crystals of siderite.
Origin: Viloco, Araca District, La Paz Dept., Bolivia
Sample size: 6.6 x 5.4 x 2.2 cm (top/2nd row), 8.3 x 6.0 x 4.1 cm (3rd/4th/5th/bottom row)
 
     
Cassiterite pseudomorph after a Carlsbad twinned orthoclase crystal
Origin: St. Just District, Cornwall, England
Ex. Ken Hollmann collection
Sample size: 2.2 x 2.0 x 1.1 cm
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

  
Origin: Oruro Department, Bolivia
Ex. Scott Williams collection
Sample size: 3.9 x 3.7 x 4.3 cm
 
  
Origin: Muhira, Lutsina, Rwanda
Ex. Scott Williams collection
Sample size: 3.5 x 2.6 x 3.3 cm
 

Photo courtesy of: 

Dan Weinrich

Dealer in fine mineral specimens

 

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