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gemstone main cabochon creation
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Mineral: quartz
Gem: petrified fern
Size:
Carat:
Cut: freeform cabochons
Origin: Brazil
General Info: The name is derived from the German "quarz" of uncertain origin. It was called "krystallos" by the Greeks, but this later became the generic term for crystal.
Additional Information
Similar in its formation to the fossilized dino bone, the fern was first buried and then slowly, over time, the cell structure was replaced (and replicated) by silica solutions. Again the coloration is a result of the secondary elements that were in the replacement silica solution. The rough material was a slice taken through the stem of the fern. It is likely from Araguana, Brazil. Probably between 180 million and 200 million years old.

It is amazing how much detail the fossilization process is able to capture. Look closely at the images below for tubular structures in the stock of the fern.

These stones cut by the author.

closeup structure from the top of the first stone.
Closeup of fern slab cut across the stock Closeup of fern slab cut across the stock
Closeup of fern slab cut across the stock Closeup of fern slab cut parallel to stock