Pentagonite

  
 
  
  
Pentagonite with calcite on stilbite
  
  
 
  
  
Pentagonite in a vug of mordenite and prehnite on basalt
Origin: Wagholi Quarry, near Poona, Maharashtra, India
Sample size: 5.4 x 5 x 4.5 cm (top/2nd row), 6.9 x 4.1 x 3.7 cm (3rd/4th row), 3.2 x 2.9 x 2.8 cm (5th/6th row), 7.7 x 7.3 x 5.2 cm (7th/8th/bottom row)
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

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