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