A very clear, large Herkimer Diamond. A Herkimer Diamond is a rare naturally formed quartz crystal. Herkimer, NY is one of the few placed on earth that these raw quartz crystals are found. They can be found loose in the dirt; but are most prized when vugs, or pockets of them are found when mining the hard matrix dolomite rock.  Very few of this size and clarity are found.
It's double termination points consist of one sharp and one chisel tip: see the picture above. The hopper crystal marking is found at this end, see bottom picture. A hopper crystal grew rapidly in stages. Each time new growth started and stopped, a step occurred. At termination you have a crystal that looks like it grew wildly in different directions stepping down to a center point. This pattern is external and is also referred to as 'negative skeletal' quartz.  This hopper marking covers a few facets.
Also near the chisel tip is found a 12 mm bridge crystal. Most of it is inside the crystal, only one termination is above the surface. Very cool to view with the loupe we are including.
This one also has an unusual shape, the pictures represent it well.
A large clear Herkimer Diamond hopper crystal with a lot going on!

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