Umangite, Calcite, Eucairite
Specimen ID: NTM-3TC
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“Very fine-grained aggregate of umangite (red) in calcite (dispersed light internal reflections). Polished section, reflected light digital image in air with crossed polars, width 0.5 mm.
Ore microscopy illuminates the darkness of the opaque "grey ugly" with true reflectance colors!
G. Grundmann collection and photo.
”
Dr. Günter Grundmann - 14th May 2020
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