Herkimer Diamond


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Large water clear quartz crystal.

One facet has a coating of black hydrocarbon.
Many more photographs below



Atypical A Grade Raw Quartz Crystal

Length: 36.5 mm
Width: 27 mm
Depth: 18 mm
Weight: 90.2 ct. / 18 g

Wow, this is a huge Herkimer Diamond with awesome clarity. Only about 15% of Herkimer Diamonds mined qualify as A grade quality, less than 3% of these are over 20 mm.
Internally a clear flat inclusion creates a beautiful color veil. Several photos show the inclusion and the color veil.
Externally clean but for one large facet with a coating of black hydrocarbon, something I've never seen before. Anthraxolite is the traditional name of the black material commonly found in Herkimer Diamond mines. It was thought to be a relative of anthracite (coal), decayed plant material that fossilized. However, new evidence suggests it is a black hydrocarbon, a thick oily substance. The new theory suggests that hydrocarbons moved through the cracks and vugs along with dissolved quartz, salt and other minerals in the earth. At some point these fluids solidified. It is found inside Herkimer's as well as surrounding them, suggesting it was present before, during and after the crystals formation. It give the quartz crystal a rich, deep hue.
All other facets are clean and smooth. It's a Herkimer Diamond as great to hold as it is to look at!

Price: US$ 290.00
Order via Paypal: **SOLD**

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Huge Herkimer Diamond
Face with black hydrocarbon reflects a deep color.

Dime in background shows size.

Photo of clear inclusion.

Photo of excellent clarity.

Sharp double terminations.

A color veil.

Large water clear quartz.

Inclusion sparks rainbows.

Huge Herkimer Diamond



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