Vermiculite

 
  
Variety jefferisite
Origin: Brinton's Quarry, Chester County, Pennsylvania, U.S.A.
ex. Haverford College, Linck Collections
Sample size: 9.5 x 8 x 0.3 cm (top), 13 x 10 x 1 cm (bottom)
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

Origin: Kovdor, Kola Peninsula, Russia
Sample size: hand specimen
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

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