cryptocrystalline quartz jade. Chalcedony and agate have a very long history. Για 100 εκατομμύρια χρόνια πριν, underground magma spewed out due to the changes in the earth's crust. Όταν η λάβα κρύωσε, steam and other gases formed bubbles, and the bubbles were sealed when the rock was frozen to form many holes. After a long [...]
