Geikielite

Origin: Monte dei tre Abati, Coli, Piacenza Province, Emilia-Romagna, Italy
Picture size: 2.2 mm
Owner: Thomas Witzke
 

Photo courtesy of: 

Thomas Witzke

Institut für Mineralogie und Lagerstättenlehre
Aachen, Germany

 

Black crystals in calcite matrix
Origin: Murun, Yakutia, Russia
Sample size: micromount
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

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