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Rocks & Minerals Definitions
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http://www.rocksandminerals.com/finder/H3.HTM
Category:
Antenna
Obsidian Obsidian is volcanic glass. Oligoclase Oligoclase has the formulae (Na,Ca)AlSi3O8 and a relative hardness of 7. It is a plagioclase feldspar.Of interest to petrologists and collectors.
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