Silvialite

A large dark bottle-green to light greyish-green crystal of Silvialite in lamprophyre rock
Origin: Loitsch Quarry, Weida, Gera, Thuringia, Germany
Sample size: 7.2 cm, crystal size is 2.5 cm
Owner: Thomas Witzke
 

Photo courtesy of: 

Thomas Witzke

Institut für Mineralogie und Lagerstättenlehre
Aachen, Germany

 

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