Snowflake Obsidian

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Snowflake obsidian.  Extrusive igneous rock found in areas of recent vulcanism. The snowflake-like blotchy spots (spherulites) are inclusions of radially clustered crystals of cristobalite (a form of quartz).
Snowflake obsidian. Extrusive igneous rock found in areas of recent vulcanism. The snowflake-like blotchy spots (spherulites) are inclusions of radially clustered crystals of cristobalite (a form of quartz).
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