Holst-Weeks prospect (Holst-Weeks deposit), West Mayacmas District, Mayacmas Mts (Mayacamas Mts), Sonoma Co., California, USA
A Mn occurrence/prospect located in sec. 1, T7N, R7W, MDM, about 3 miles NE of the Skyhawks Community neighborhood of Santa Rosa and W of St. Helana (Napa County).
A Franciscan Mn deposit.
ReferencesTrask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 187.
Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 284.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 415.
1 entry listed. 1 valid mineral.
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Locality Updated: Doleritic lava flows, Reyran valley, Fréjus, Var, Provence-Alpes-Côte d'Azur, FranceFrom Pascal Chollet, 10th Dec 2013 21:43:38