Blue-Chalcedony is a form of quartz that’s microcrystalline and compact. Blue-Chalcedony has a vitreous to waxy luster that has a beautiful and inviting translucence. Blue-Chalcedony is a transparent-to-opaque stone that’s colored by traces of copper, manganese, titanium, and iron. The name Chalcedony is said to have come from the port city Chalcedon in Greece. Blue-Chalcedo is rated between 6.5 and 7 on the Mohs scale of hardness. Blue-Chalcedony is thought to promote flow; boost presence of mind; perception and communication with others.