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Mar John prospect (Mar John Mine; Marjon; Old Calaveras group; Calaveras; Enchantress; Oro Minto), Sheep Ranch, Mountain Ranch District, East Belt, Calaveras Co., California, USA
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List of minerals arranged by Dana 8th Edition classification
Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Pyrite2.12.1.1FeS2
Skutterudite2.12.17.1(Co,Fe,Ni)As2-3
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
A3(XO4)2·xH2O
Erythrite40.3.6.3Co3(AsO4)2 · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals
Skutterudite
var: Smaltite
-(Co,Fe,Ni)As2


9 entries listed. 9 valid minerals.

References

Logan, Clarence August (1924), Sacramento field division: California Mining Bureau. Report 20: 4.

Hess, Frank L. (1927), Rare metals – cobalt: Mineral Resources U.S., 1924, part 1: 451.

Logan, Clarence August and Franke, H. (1936), Mines and Mineral Resources of Calaveras Co.: California Division of Mines, California Journal of Mines & Geology, California Division of Mines (Report 32): 32(3): 271-274, 304, 312.

Clark, Wm. B. & P.A. Lydon (1962), Mines and mineral resources of Calaveras County, California: California Division of Mines & Geology County Report 2; [… Geological Society of America Proceedings, 1933]: 36, 62-63, 131 & Pl. B.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 179, 340.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 78.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10029485.

Rocks & Minerals 82 (2007): 402-407.

Cobalt; a Materials Survey, U.S. Bureau of Mines Information Circular 8103.

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