29 Jun

Chalcedony

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Chalcedony is not scientifically its own mineral species, but rather a form of Quartz in microcrystalline form. However, the name is an old name, and almost all mineral reference guides and collectors distinguish Chalcedony separately from Quartz. In the gem trade, the name Chalcedony usually describes only white or blue Chalcedony, to distinguish it from the multicolored banded variety Agate and other unique varieties of this mineral. There are many varieties of Quartz that can be called Chalcedony but on this site, I refer to Chalcedony to the microcrystalline form that is very difficulty to work, even with diamond tools.

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