Obsidian is formed by the sudden cooling of magma from volcanic lava in water. The magma around the lava flow cools and condenses rapidly when it meets seawater, and the crystal structure does not have enough time to grow. Magma rapidly cools to form natural glass, which belongs to impure crystal gem, and its main component is silicon dioxide (SiO2).
In the process of formation, because the temperature around the lava flow drops rapidly and the cooling rate is the fastest, the magma containing silicon dioxide quickly condenses into blocks, and obsidian generally appears around the lava flow or near the seaside at the foot of the volcano. Because of its unique formation process, the crystal of obsidian also contains 1-2% water.
Classification by composition
Moon-eyed obsidian
There are actually three kinds of moon-eyed obsidian: full moon-eyed obsidian, crescent-eyed obsidian and rainbow-eyed obsidian.
The full moon obsidian is second only to the rainbow eye obsidian in the moon eye obsidian. Excellent varieties have pure colors and round cat eyes.
Rainbow-eyed obsidian is the best obsidian, which naturally forms many color circles on the basis of full moon cat's eye obsidian. The more colors, the rarer and the better the quality. Because some can best appear in dozens of colors, it is named rainbow-eyed obsidian.
Obsidian crescent appeared because it didn't all form cat's eyes when growing.
Wujin obsidian
Wujin obsidian is the obsidian that reaches the gem level. Because it is extremely delicate, it has no cat's eye effect. The color is as bright as crow's blood stone. Obsidian in Wujin is the most common and the lowest price.