Quartz
Unknown Owner
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A loose glassy gem colorless crystal of quartz. Double terminated and in very good condition with no points of attachment. These are known locally as Herkimer diamonds.The Herkimer County region in upstate New York has a rich history rooted in stone quarrying, local lime production, and recreational mineral collecting that dates back to the nineteenth century. Geologically, the area is characterized by exposed outcrops of the Upper Cambrian Little Falls Dolostone, a sedimentary rock formation that accumulated in shallow marine environments over five hundred million years ago. Within this dolostone, small cavities or vugs formed through replacement and dissolution processes. These vugs became coated with silica-bearing hydrothermal fluids that crystallized slowly over millions of years, producing exceptionally clear, double-terminated quartz crystals known popularly as Herkimer diamonds, frequently accompanied by minor pockets of carbonaceous matter, pyrite, and dolomite.
Product details
SpeciesQuartz
SizeThumbnail
Dimensions2.2 x 1.5 x 1.0 cm
Added on07/26/2026
LocalityUSA, New York, Herkimer County
Known provenance
| Date | Collector | Acquisition price |
|---|---|---|
| 08/2026 | Unknown Owner | Not disclosed |
| — | Weinrich Minerals | Not disclosed |
Comments