Tabby & Twin Crystals
Black Herkimer Diamond Specimens


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Great tabby specimen.    Black Diamond

Internal hydrocarbon show, where color veil flashes.

Complete tabby crystal cluster.    Unusual Herkimer

Tabby Crystal Cluster

Shows how thin the crystal is.    Right view of tabby.
Above photographs of black tabby crystal.


Two Atypical C Grade Crystals  
Length: 14.75-21 mm
Width: 10-17 mm
Weight: 21.6 ct. / 4 g total

A pair of two unusual black Herkimer Diamonds specimens. One photographed above, the other below. Finding black hydrocarbon in the Herkimer mines is not unusual, but these crystals have it in spades. With this much black material inside we consider them black Herkimer Diamonds. The formation of them is unusual as well, as seen in the photographs of the tabby crystal above, and the twin crystal below. Specific sizes and descriptions:

  • This 21x17x6.5 mm (15.7 ct.) is a black tabby cluster. A complete cluster of three crystals, 7 mm, 11.5 mm and the main one 21 mm. Each are double terminated and flat. It's the thinnest Herkimer tabby crystal I've ever seen. The hydrocarbon is internal and produces a color veil. Very cool with a loupe.
  • The smaller specimen is 14.75x10x7.5 mm (5.9 ct.) and photographed below. It looks to be double terminated, but with a closer look, it's actually a penetration twin crystal. The hydrocarbon is also internal and a few baby crystals surface from one tip. Awesome with a loupe.

A great set of black diamond specimens for the crystal collector.

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Photographs of the penetration twin crystal.
Photo shows twin points.    Crystal measures 14x10 mm.

Black Diamond Specimen.    

Black hydrocarbon is seen.    Baby crystals are seen.



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