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    "depname" : "Magnet Cove",
    "deptype" : 10,
    "depage" : "97\u009695±5 K-Ar, biotite;|103±10 fission-track, apatite",
    "json" : "{\"id\":\"http:\\/\\/mrdata.usgs.gov\\/carbonatite\\/record\\/55\",\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[-92.854444444444,34.435833333333]},\"properties\":{\"country\":\"United States\",\"cntrycd\":\"USAR\",\"stprov\":\"Arkansas\",\"depname\":\"Magnet Cove\",\"latitude\":\"34.4358333333333\",\"latdeg\":34,\"latmin\":26,\"latsec\":9,\"longitude\":\"-92.8544444444444\",\"londeg\":-92,\"lonmin\":-51,\"lonsec\":-16,\"discdate\":\"1806\",\"startdate\":\"1944\",\"mintype\":\"s\\u00f6vite\",\"oreton\":\"7.26\",\"deptype\":10,\"niobium\":\"0.11\",\"ree\":\"0\",\"p2o5\":\"0\",\"grades\":\"Erickson  and Blade (1963)\",\"depage\":\"97\\u009695\\u00b15 K-Ar, biotite;|103\\u00b110 fission-track, apatite\",\"agemy\":\"101\",\"tectset\":\"North America Paleozoic midcontinent carbonate platform\",\"rocks\":\"carbonatite, ijolite, jacupirangite, melteigite, metagabbro, nepheline syenite, phonolite, trachyte\",\"rocksmap\":\"calc-silicate rocks, chert, conglomerate, limestone, sandstone, shale (Paleozoic)\",\"orebody_fm\":\"oval alkaline complex 5 x 4.7 km containing carbonatite lenses\",\"ore_a\":\"5\",\"ore_area\":\"18.5\",\"ore_b\":\"4.7\",\"alttype\":\"fenitization (ring)\",\"altwidth\":\"0.8\",\"comments\":\"Past production mainly Ti and Fe, 0.04% Nb2O5 in ore (Kun, 1962). According to  Erickson  and Blade (1963), reserves contain 4\\u00968% TiO2 and 0.05\\u00960.15% Nb2O5 or 5.4 t Nb2O5 content.\",\"mineral\":[{\"role\":\"ore\",\"name\":\"anatase\"},{\"role\":\"ore\",\"name\":\"apatite\"},{\"role\":\"ore\",\"name\":\"barite\"},{\"role\":\"ore\",\"name\":\"brookite\"},{\"role\":\"ore\",\"name\":\"chalcopyrite\"},{\"role\":\"ore\",\"name\":\"eudialyte\"},{\"role\":\"ore\",\"name\":\"fluorite\"},{\"role\":\"ore\",\"name\":\"ilmenite\"},{\"role\":\"ore\",\"name\":\"kimzeyite\"},{\"role\":\"ore\",\"name\":\"magnetite\"},{\"role\":\"ore\",\"name\":\"molybdenite\"},{\"role\":\"ore\",\"name\":\"perovskite\"},{\"role\":\"ore\",\"name\":\"pyrite\"},{\"role\":\"ore\",\"name\":\"pyrrhotite\"},{\"role\":\"ore\",\"name\":\"rutile\"},{\"role\":\"ore\",\"name\":\"synchysite\"},{\"role\":\"gangue\",\"name\":\"actinolite\"},{\"role\":\"gangue\",\"name\":\"aegerine\"},{\"role\":\"gangue\",\"name\":\"ankerite\"},{\"role\":\"gangue\",\"name\":\"biotite\"},{\"role\":\"gangue\",\"name\":\"calcite\"},{\"role\":\"gangue\",\"name\":\"garnet\"},{\"role\":\"gangue\",\"name\":\"gypsum\"},{\"role\":\"gangue\",\"name\":\"hercynite\"},{\"role\":\"gangue\",\"name\":\"kaolinite\"},{\"role\":\"gangue\",\"name\":\"montichellite\"},{\"role\":\"gangue\",\"name\":\"phlogopite\"},{\"role\":\"gangue\",\"name\":\"quartz\"},{\"role\":\"gangue\",\"name\":\"smectite\"},{\"role\":\"gangue\",\"name\":\"vesuvianite\"},{\"role\":\"gangue\",\"name\":\"wollastonite\"},{\"role\":\"gangue\",\"name\":\"zeolite\"}],\"reference\":[\"Erickson, R.L., and Blade, L.V., 1963, Geochemistry and petrology of the alkalic igneous complex at Magnet Cove, Arkansas: U.S. Geological Survey Professional Paper 425, 94 p.\",\"Flohr, M.J., 1994, Titanium, vanadium, and niobium mineralization and alkali metasomatism from the Magnet Cove complex, Arkansas: Economic Geology, v. 89, p. 105\\u0096130.\",\"Flohr, M.J., and Ross, M., 1990, Alkaline igneous rocks of Magnet Cove, Arkansas\\u0097Mineralogy and geochemistry of syenites: Lithos, v. 26, p. 67\\u009698.\",\"Howard, J.M.,  and Chandler, A., 2007, Magnet Cove, a synopsis of its geology, lithology and mineralogy: AGES Brochure Series 004, 11 p., http:\\/\\/www.geology.arkansas.gov\\/pdf\\/pamphlets\\/magnet_cove.pdf (last visited April 15, 2009)\",\"Kun de, N., 1962, The economic geology of columbium (niobium) and of tantalum: Economic Geology, v. 57, p. 377\\u0096404.\",\"Nesbitt, B.E., and Kelly, W.C., 1977, Magmatic and hydrothermal inclusions in carbonatite of the Magnet Cove complex, Arkansas: Contributions to Mineralogy and Petrology, v. 63, p.272\\u0096294.\",\"Woolley, A.R., 1987, Alkaline rocks and carbonatites of the world, Part 1\\u0097North and South America: London, British Museum (Natural History), 216 p.\"]}}",
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}