Huge Herkimer Diamond on Sparkling, Druzy Quartz - New York

This is an exceptionally nice cluster of clear "Herkimer Diamonds" on a druzy quartz crystal encrusted matrix which really gives this specimen some sparkle. It was collected from The Ace of Diamonds Mine in Herkimer County, New York and has about seven relatively large herkimer diamonds clustered together, with the largest measuring 2.1" long from termination to termination. Most people are used to seeing Herkimers free of the matrix, so these ones in matrix are very interesting specimens.

Comes with an acrylic display stand to assist with presentation.

Herkimer diamonds are not actual diamonds but rather double terminated quartz crystals found in and around Herkimer County, NY. The diamond in the names from not only their exceptional clarity but also because they look naturally faceted when found. Only these crystals found in Herkimer County, New York can be called "Herkimer Diamonds". Similar double terminated quartz crystals have also been found in abundance in Tibet and Afghanistan, but these are not true Herkimer Diamonds.

The geologic history of these crystals began 495 million years ago in a shallow sea. Waxy organic material along with quartz sand and pyrite was encased in rock made of dolomite and calcite. As sediment buried the rock and temperatures rose, crystals grew very slowly, resulting in quartz crystals of exceptional clarity. Inclusions can be found in these crystals that provide clues to the origins of the Herkimer diamonds: solids, liquids (salt water or petroleum), gases (most often carbon dioxide), two- and three-phase inclusions, and negative (uniaxial) crystals.

Silicon Dioxide, also known as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.
The Ace of Diamonds Mine, Middleville, Herkimer County, New York
Largest Crystal 2.1" long, Entire specimen 6.4 x 4.7"