Latitude: 40°22'6"N
Longitude: 123°27'6"W
A former Mn mine located in the NW¼ sec. 23, T1S, R1E, HM.
The mine consists of a series of cuts in a massive manganese orebody overlain by cherts and sandstones.
The open cuts were not productive of specimens. Down sloop in the stream bed the collecting was much better. Some boulders had veins of opaque white calcite running through them and those that had little black "sticks" of Inesite growing into the calcite were what you were looking for. The black "sticks" were actually oxidized Inesite crystals. You would break up the boulders and try and extract chunks of matrix rich in Calcite shot through with Inesite, which you could haul back to the car a few km away. Later you would use a 10% water/nitric acid solution to etch away the calcite and expose the pink Inesite crystals. A few were barite pseudomorphs after Inesite. Other acids tended to tear up the Inesite and turn it quite white.
[Rock Currier 2010]
References
Taliaferro, Nicholas Lloyd & F.S. Hudson (1943), Genesis of the manganese deposits of the Coast Ranges of California: California Division Mines Bulletin: 269.
Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 59, 194-206.
Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 310, 314, 318, 319.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 101, 228, 321.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 50, 167, 222, 383, 414, 493.
Dunning, G. and Cooper, J. (1987), Inesite from the Hale Creek Mine, Trinity County, California, The Mineralogical Record: 18(5): 341-347.
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