Clinohumite

Origin: Jacupiranga mine, Sao Paulo, Brazil
Sample size: 1 cm, crystals 4 mm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

Dark redbrown crystals in phlogopite matrix
Origin: Kovdor, Kola Peninsula, Russia
Sample size: 2 x 3 cm matrix
 
Origin: roadcut between Escouloubre (Dept. Aude) and Usson (Dept. Ariège), France
Sample size: 3 x 4 cm

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

  
 
Origin: Kukh-i-Lal, Pyandzh Valley,Pamir Mountains, Tajikistan
Sample size: 1.0 x 0.9 x 0.6 cm (specimen) and 5 x 5 x 4 mm (gemstone) (top), 1.1 x 0.8 x 0.7 cm (specimen) (bottom)
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

  
 
  
 
  
 
  
 
  
 
  
Origin: Ladjuar Madan, Kokcha Valley, Afghanistan
Sample size: 2.1 x 1.2 x 1 cm (top/2nd row), 1.9 x 1.3 x 1 cm (3rd row), 1.8 x 1.4 x 1 cm (4th/5th row), 1.7 x 1.3 x 1.1 cm (6th/7th row), 1.5 x 1 x 0.6 cm (8th/9th row), 1.6 x 1.1 x 0.8 cm (10th/bottom row)
 

Photo courtesy of: 

John Veevaert, Trinity Mineral Co

Trinityminerals.com

 

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