Greifensteinite

Tabular crystal of greifensteinite on tourmaline
 
Origin: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany (type locality)
Picture size: 1 mm (top and middle), 6 mm
Owner: Thomas Witzke
 

Photo courtesy of: 

Thomas Witzke

Institut für Mineralogie und Lagerstättenlehre
Aachen, Germany

 

Spherical aggregates with a coverage of a yellow clay mineral
Origin: Galiléia, Governador, Valadares, Minas Gerais, Brazil
Sample size: micromount
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

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