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Corundum by Wavelength Dispersion X-Ray Spectrometry

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Corundum by Wavelength Dispersion X-Ray Spectrometry for pyrope, but confirmed as corundum by wavelength dispersion X-ray spectrometry. CORUNDUM Al2O3 UPDATE FROM: Robinson, G.W., and Carlson, S.M., 2013, Mineralogy of Michigan A metamorphic mineral in high-grade aluminous Update: published online by A.E. Seaman gneisses. It is also found in some contact Mineral Museum, Houghton, MI, 46p. metamorphic rocks, in albite-rich veins in altered peridotites, eclogites, and some syenites. Predominantly in the Northern Peninsula. Iron County: The first verified occurrence of corundum in Michigan is in two specimens of eclogitic xenoliths in the Lake Ellen kimberlite (q.v.) (SW ¼ section 27, T44N, R31W) (McGee and Hearn, 1983). Corundum occurs as small grains (0.05 to 0.6 mm) near kyanite and may have been formed as a product of a reaction upon the kyanite that occurred during the ascent of the host kimberlite from mantle to crustal levels. An analysis is given by McGee and Hearn (1983). Marquette County: 1. Beacon iron mine: Reported by Dorr and Eschman (1970), but probably not correct. A rare blue mineral found here may be kyanite (K. Spiroff, personal communication). 2. Champion mine: Reported as blue sapphire with muscovite in pegmatite (Zeitner, 1964). Massive dark blue corundum (originally misidentified as “kyanite”) occurs with andalusite and muscovite on a single specimen (FWH 117) in the collection of the A. E. Seaman Mineral Museum (Michigan Technological University). Confirmed by energy dispersion X-ray spectroscopy. Wayne County: Ottawa Silica Company quarry, Rockwood: The carbonaceous material (q.v.) concentrated along the base of the Sylvania Sandstone contains, in its accessory heavy-mineral suite, rare grains of corundum-a most unexpected discovery, but verified by electron microprobe (Heinrich, 1979). FROM: Robinson, G.W., 2004 Mineralogy of Michigan by E.W. Heinrich updated and revised: published by A.E. Seaman Mineral Museum, Houghton, MI, 252p. UPDATE Menominee County: Near Hermansville: A few small (0.8 mm) bright red chromian corundum (“ruby”) fragments were recovered from glacial sediments in 2005. The material was first mistaken .
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