Is mud obsidian worth buying?

Whether it is necessary to buy obsidian depends mainly on personal preference. Although obsidian is a low-grade gem, there are some expensive varieties, such as rainbow-eyed obsidian, ice obsidian and obsidian. Obsidian is mainly due to the rapid cooling and condensation of volcanic lava, and the crystal structure does not have enough time to grow. Obsidian usually appears on the periphery of lava flows because it cools fastest. Obsidian is also the best gem for Buddhist practice and charity. Its color is transparent, black or dark green, or it may be all monochrome, stripes or spots.