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A piece of dolomite limestone tumbled to a worn down rock. One theory of the formation of these rare quartz crystals states the mineral dolomite began as limestone and calcite rock. When the rock was still beneath the sea, magnesium was added. This addition of magnesium created the matrix rock of dolomite along with the pockets where the quartz crystals grew.
On this specimen, a single Herkimer Diamond juts out from the bottom edge of the dolomite. It measures 10 mm and is sprinkled with black anthraxolite on one side. Anthraxolite is actually decayed plant material that fossilized - remember, these crystals are dated at 300-500 million years old. The anthraxolite in this mineral is completely suspended within the quartz. While pretty, a C Grade point.
There is a tiny hole in the dolomite rock, another vug possibly?
This Herkimer Diamond would be a good starter mineral specimen. |