Sphalerite with willemite. The spalerite has a nice phosphorescence, which helps to distinguish it from calcite. SW en MW-UV combined.
The specimen is from the Franklin mining district.
Another Franklin combo
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Sphalerite with willemite. The spalerite has a nice phosphorescence, which helps to distinguish it from calcite. SW en MW-UV combined.
The specimen is from the Franklin mining district.