![]() If the formation of crystals happens in a radial cluster of white or gray crystals (cristobalite) at different and isolated locations, it is referred to as Snowflake obsidian. Overtime crystallization process takes place in the mass of rock. Obsidian is kind of glass and chemically unstable. When two colors, Black and Brown, swirled together in a single obsidian rock, Mahogany Obsidian takes place. ![]() The main types of Obsidian rocks are as follows: Based on the texture of the Obsidian rock, types are decided. Geologically, rocks are used to divide into types. It means it is vitreous, and due to the high presence of silica and other glass-forming minerals, it is translucent in transparency. It is a less porous rock, so it has a medium hardness. It also means obsidian is easy to scratch.
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