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SNOWFLAKE OBSIDIAN
Snowflake Obsidian is a volcanic glass that is usually dark black or brownish black with white markings. This glassy, lustrous mineral is found in lava flows, and obsidian stones can be massive. Obsidian is formed when viscous lava from volcanoes cools rapidly. Most obsidian is 70 percent silica.
Hardness 5 to 5.5

