Snowflake obsidian

Snowflake obsidian

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Credit: TH FOTO-WERBUNG/SCIENCE PHOTO LIBRARY

Caption: Snowflake obsidian pebble. Obsidian is an igneous volcanic rock formed by the rapid cooling of granitic magma. Its black colour is due to the presence of small amounts of iron. Snowflake obsidian contains inclusions of white radial cristobalite clusters, a form of quartz.

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Keywords: cristobalite, earth science, geological, geology, igneous rock, mineral, obsidian, polished, quartz, rock, rocks, snowflake, volcanic rock

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