Obsidian Gemstone meaning With its glassy luster, obsidian is a distinctive stone. Obsidian is formed as lava from volcanic eruptions cools within the earth. The speed at which it cools prevents crystallization and the rock forms as solid volcanic glass. Obsidian was revered by ancient cultures. It was one of the major barter materials, and prized for its ability to be worked to razor-sharp edges for arrows and spears. It has been used since prehistoric times for making tools, masks, weapons, mirrors and jewelry. Healing properties Obsidian helps to protect the very sensitive against depression. It is the stone of the soft-hearted and gentle people of the world. Use obsidian to help block negativity of any kind. As a black gemstone, it symbolizes self control and resilience. Black stones have protective energies in the sense that black is the absence of light, and therefore, can be used to create invisibility. The black obsidian is used to help one become more grounded, focused and clear in all practical matters. It can also help develop razor-like mental abilities and the powers of discernment. Because the black obsidian expresses a clear, detached energy of truth without