Herkimer diamond
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Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. They are not diam
"Herkimer Diamant" - Middleville, County of Herkimer, New York, US
Crystals of type "Maramureș diamond" found in the Ukrainian Carpathians.
Double terminated crystal
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A doubly terminated crystal, or double-terminated crystal, is a crystal with natural facets on both ends.
Herkimer diamond
…Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. They are…
Doubly terminated amethystine quartz crystal