Aurorite, Calcite
North Aurora mine, Summit area, Treasure Hill, Silver Belt, White Pine Mining District, White Pine County, Nevada, USA
Reflected light digital image of aurorite crystal aggregate (strongly pleochroic from bright to dark- grey, corresponding to different extinction rotations) in calcite matrix (dark-grey, with brownish internal reflectance) in plane polarized light. Width of image 0.2 mm.
Ore microscopy illuminates the darkness of the opaque "black ugly" with ...
© Günter Grundmann, Detmold, Germany