O is for obsidian

January 1, 2011

Although a relative youngster in geologic terms, obsidian can change over time from glass to mineral.

Publication Year	2011
Title	O is for obsidian
Authors	W. H. Langer
Publication Type	Article
Publication Subtype	Journal Article
Series Title	Aggregates Manager
Index ID	70003937
Record Source	USGS Publications Warehouse
USGS Organization	Central Mineral and Environmental Resources Science Center

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