Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth’s continental crust, behind feldspar.
While softer than actual diamond, they are still hard enough to scratch glass, scoring a 7-7.5 on the Mohs Hardness scale (diamond scores 10). The most valuable Herkimer diamond gemstones are crystal clear, though some will contain inclusions which will result in cloudier colored crystals.
Herkimer Diamonds are double terminated quartz crystal famously found in Herkimer County, New York, USA.
A Double Terminated crystal is a crystal with two naturally faceted ends. It is a rarer form of crystal as it forms free-floating in pockets of clay, rather than on one side of a stone.
All of our Minerals and Crystals are 100% Genuine Specimens & come with a Certificate of Authentication
Pack of 5
Specimen: Rare Herkimer Diamond
Size (picture scale cube=1cm): See 1cm scale cube for size
ACTUAL AS SEEN: The image shows the EXACT specimen you will receive. The specimen has been carefully hand selected and photographed. Measurements are as accurate as possible, though be aware measuring precise dimensions can be difficult from irregular shaped items. Whilst we portray colours as close to life-like as we can, colours will vary if taken in sunlight, indoors, from monitor to monitor and device to device. Once this specimen is sold, we will update this listing with new similar selected item, with a new photo and dimensions.
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