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Can anyone tell me what kind of stone this is?

Can anyone tell me what kind of stone this is?

Unheated aquamarine. In my view, this is so much more interesting than the blue that results from heat treatment!

Unheated aquamarine. In my view, this is so much more interesting than the blue that results from heat treatment!

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Gems

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Gems

Fire Agate  a variety of chalcedony (SiO2), is a semi-precious natural gemstone found only in certain areas of northern Mexico and the southwestern United States.There is no actual object inside the stone, this special effect arises from light interference within the microstructure layering of the gem.  Photo by Captain Tenneal. Shaped and polished piece.

Fire Agate a variety of chalcedony (SiO2), is a semi-precious natural gemstone found only in certain areas of northern Mexico and the southwestern United States.There is no actual object inside the stone, this special effect arises from light interference within the microstructure layering of the gem. Photo by Captain Tenneal. Shaped and polished piece.

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