Millerite, Thompson Open Pit, Thompson, Manitoba
About 25 years ago, when crews at the Thompson mine were mining the crown pillar of the Thompson mine, they encountered a vein of calcite and millerite. The veins were composed of long , tightly packed needles of millerite in carpets on each side of the vein and the calcite was in between. The millerite was exposed by etching away the calcite with acid. These are excellent examples of this mineral from that discovery.
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