Originally posted by Hoss post=115124
As the USGS states: chalcedony is a catch-all phrase.
Chalcedony is little more Descriptive than saying "Stone".
There's a lot of local names for the same types of stone . Out west if it feels waxy it chalcedony just another form of Quartz .Very fine-grained variety of the silica mineral quartz. A form of chert, it occurs in a great variety of colours, usually bluish white, gray, yellow, or brown. Other physical properties are those of quartz. For centuries, chalcedony has been the stone most used by gem engravers .
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