From Vista Point, Del Norte County, CA
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Eight mineral grains from the "debris" in the Ace of Diamonds mine in Herkimer, New York.
Double-terminated quartz crystals, sometimes called Herkimer diamonds, from the Ace of Diamonds mine in Herkimer, New York.
Rutile needles exsolved on the surface of a biotite grain from the Devonian-aged Tioga bentonite exposed in Seven Fountains, VA.
Sample provided by Dr. Dan Doctor, US Geological Survey.
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