4-8-013: argillite - Pima District - Pima Mine

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Specimen Number4-8-013Alternate NumberP-3CommentsTriassic (?) argillite. Slightly oxidized, altered to chlorite, pyrite, and carbonate in veinlets that have been moderately oxidized. Non-reactive nature of unit is apparent. Pyrite is both in veinlets and disseminated. Minor talc present. Brittle fracture is characteristic of the argillites, arkoses, and lithic arenites that are pre-ore.In Teaching CollectionNoMineral(s)pyritequartzRock NameargilliteDistrictPimaMinePimaExternal LinkMindatGeo-LocationundefinedSub-LocationundefinedDeposit TypePorphyry CopperGeo-Coords^[1]Reference MaterialACL-109: Thurmond, R.E., and Storms, W.R., 1958, Discovery and Development of the Pima Copper Deposit, Pima Mining Co., Pima County, Arizona, Bur. Mines Inform. Circ. 7822, 19 p.

ACL-113: Thurmond, R.E., Olk, J.F., Komadina, G.A., Journeay, J.A., Spaulding, E.D., and Hernlund, R.W., 1958, PIMA: a three-part story, Min. Eng., p. 453-462.

ACL-121: Langlois, J.D., 1976, Geology of the Cyprus Pima mine, Pima County, Arizona, in Jenney, J.P., and Hauck, H.R., eds., AZ Geol. Soc. Digest Volume XI, Proceedings of the Porphyry Copper Symposium, Tucson, AZ, March 18-20, p. 103-114.

ACL-153: Cooper, J.R., 1960, Some Geologic Features of the Pima Mining District, Pima County, Arizona; U.S. Geol. Surv. Bull. 1112-C, Washington, D.C., 40 p.

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4-8-013: argillite - Pima District - Pima Mine