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.
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Tourmaline, Various colors. San Diego Ca.
Pink Tourmaline. San Diego Ca
Green Tourmaline. San Diego Ca
Agate Nodules Sibley Volcanic Preserve. Ca.
Beach-Agate. Cambria-Ca
Banded Obsidian, Modoc Plateau Ca.
Banded Obsidian. Lake County. Ca. Collected by Chris Reynolds
Chert. Red Jasper. San Francisco County
Chert, Jasper. San Francisco County
Gold in Quartz. Sierra Nevada Range. Ca
Quartz Point on a dime. S.L.O. Ca
Micro Quartz Crystals. S.L.O. Ca.
Micro Quartz Crystals. S.L.O. Ca.
Rhyolite. Ebbitts Pass Ca.
Gypsum, Calcium Sulfate Dihydrate. Diablo Range Ca.
Sulphur Crystals. Hawaii
Calcite Crystals, Lake Shasta Ca.
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
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