Acanthite
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Acanthite (black needles) on Silver, Trevassack Quarry, Lizard, Cornwall, England   Field of view 4mm

Trevassack Quarry, Lizard, Cornwall, England
Crown Point Mine,Boise, Idaho, USA    Crystal Size 0.5mm
Crown Point Mine,Boise, Idaho, USA    Crystal Size 0.5mm
Crown Point Mine,Boise, Idaho, USA