Blue Chalcedony is a stone in any form of microcrystalline or cryptocrystalline quartz. It's common for these only be sold in translucent, single color types.
Blue Chalcedony is a semi-translucent form of cryptocrystalline silica where the crystals are too tiny to see with the naked eye. Chalcedony comes in a variety of shades.
Chalcedony is a mineral, mostly quartz with a lesser component of moganite, basis for semi-precious stones like agate and onyx. Blue chalcedony is one semi-precious stone variety.
Blue chalcedony is gemstone mineral. Nodular form blue chalcedony mine is located in Turkey. See blue chalcdony stone and mining pictures from http://chalcedonymine. com
