14-3-018: gabbro - Stillwater District - Stillwater Mine

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Specimen Number14-3-018Alternate NumberSW-11CCommentsSample collected by Daven Mashburn. Gabbronorite unit (2 pyroxene gabbro), occurs directly on top of Basal Norite cumulate. Called PBAC (plagioclase bronzite augite cumulate) by mine geologists. The augite only occurs as a cumulate on the footwall of the PGE troctolite. Cpx > opx in general.In Teaching CollectionNoMineral(s)plagioclasepyroxeneRock NamegabbroDistrictStillwaterMineStillwaterExternal LinkMindatGeo-LocationundefinedSub-LocationundefinedDeposit TypeLayered mafic intrusionGeo-Coords^[1]Reference MaterialACL-171: Gold, D.P., and Mueller, P., eds., 1979, Field Trip Guide to the Stillwater Layered Intrusive Complex, Montana; U.S. Nat'l. Comm. Arch. Geochem., 1979 Ann. Field Conf., Y.B.R.A. Camp, Red Lodge, Montana, August 12-18, 1979, 39 p.

ACL-172: Page, N.J., and Nokleberg, W.J., 1974, Geologic Map of the Stillwater Complex, Montana; Misc. Invest. Ser. Map I-797, Reston, VA.

ACL-225: Howland, A.L., 1955, Chromite Deposits in Central Part Stillwater Complex, Sweet Grass County, Montana; U.S. Geol. Surv. Bull. 1015-D, Washington, D.C., 26 p.

ACL-230: Mertie, J.B., 1969, Economic Geology of the Platinum Metals; U.S. Geol. Surv. Bull. 630, Washington, D.C., 120 p.

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14-3-018: gabbro - Stillwater District - Stillwater Mine

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14-3-018: gabbro - Stillwater District - Stillwater Mine