| References: | Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 83; Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 181-182; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 101; California Division of Mines and Geology Open-File Report 77-14 (1977): 809-814; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 413, 415. |