Large and all but double terminated, this crystal weighs in at 116 grams! One of the facets measures a whopping 46x25 mm.
The crystal also features a small "window". A 'window' is recognized by a diamond-shaped "window" located at an area where the facet lines should have come together, but instead create the 4 corners of the diamond. The window is located very close to the incomplete termination point.
The opposite termination point is complete to the naked eye, a very slight chip can be seen with a loop.
Although the crystal appears to be missing some of the back facets, this Herkimer crystal is in its complete form, and not broken.
Because the crystal went through some very extreme conditions, it has many fractures. It is these fractures that create the famous rainbows found in Herkimer's; and if it's rainbows you're looking for, this Herkimer has them! We even caught some in the photographs, not an easy feat. The largest rainbow in this gem stone shines out from 2-3 of the large facets.
Tip: View your Herkimer's from different angles and in different lighting conditions to get the full extent of the rainbows in your crystal.
Both anthraxolite and dolomite matrix are present on the stone, both internally and externally.
This Herkimer Diamond window crystal is a specimen that will be appreciated by those who work with minerals as well as those who collect and display them. It is incredible crystal to view, hold and behold.