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Chalcedony from Marin County, California, USA

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  • California
[var. Agate] Pelletier, 1962. Mineral Species & Localities of Marin County
Mitchell, J.R. (1995) Gem Trails of Northern California.
Mitchell, J.R. (1995) Gem Trails of Northern California.
[var. Carnelian] Elder, W. P. (2001). Geology of the Golden Gate Headlands. Geology and Natural History of the San Francisco Bay Area: A Field-trip Guidebook. US Geological Survey Bulletin, 2188.
 
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