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The Electronic Closet (ECS)

Minerals, Rocks, and Stones.. 

"A mineral is a naturally occurring inorganic element or compound having an orderly internal structure
and characteristic chemical composition, crystal form, and physical properties. 
Common minerals include quartz, feldspar, mica, amphibole, olivine, and calcite.
A rock is an aggregate of one or more minerals, or a body of undifferentiated mineral matter." According to the U.S.G.S.

Identification Resources.. 
The Audubon Society Field Guide to North American Rocks and Minerals.
California Natural History Guides Geology of the Sierra Nevada.
California Natural History Guides Geology of the San Francisco Bay Region.
And many "Road Cut" guides

San Francisco Gem and Mineral Society logo