How Is Coal Like Obsidian?

How Is Coal Like Obsidian? Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers called coal beds. How do

Where To Find Obsidian In California?

Where To Find Obsidian In California? Obsidian, that attractive volcanic glass, is common in the Western states. With California’s enormous area and high geological diversity, it’s no wonder that you can find obsidian in so many places. Where can I collect obsidian? Best Places To Find Obsidian in The United States. … Glass Butte, Oregon.