Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock . It is produced when lava cools rapidly and does not have time to crystallize . Obsidian is usually black or dark brown in color, but it can also be green, gray, or red .

Obsidian has been used for thousands of years to make tools and weapons because of its sharp edges . It was used by ancient peoples to make knives, arrowheads, and other cutting tools . Today, obsidian is still used for making knives and other cutting tools. It is also used for decorative purposes such as jewelry and sculptures .

Obsidian is believed to have healing properties. It is said to help with emotional healing and provide protection against negative energy . Obsidian is also believed to help with physical healing by improving circulation and reducing inflammation .

In conclusion, obsidian is a fascinating volcanic glass that has been used for thousands of years to make tools and weapons. Its sharp edges make it ideal for cutting and slicing. Obsidian is also believed to have healing properties that can help with emotional and physical healing.