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Definition of herkimer diamond

Rock crystal, from Herkimer County, N.Y.

Herkimer diamonds are a variety of quartz crystals from Herkimer, Co. New York that have been popular with collectors for more than 100 years and various localities for them in Herkimer are still producing many specimens each year even though it requires a lot of hard manual labor to find good examples. The are frequently doubly terminated with prism faces about as prominent as the pyramidal terminations.

Herkimer quartz crystal
Herkimer quartz in matrix

Click here for the Herkimer County, New York, USA locality page Herkimer quartz crystals.
[Rock Currier 2012]

Similar quartz from other areas should be called “Herkimer-like” to differentiate them from material collected in Herkimer County.
[WW Besse 2012]
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