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Her late husband Walter McCrone studied the map during the 1970s and published micrographs of seemingly synthetic anatase crystals in the ink.
June saw them undertaking the long journey to the Glenover phosphate deposit in the Northern Province to look for apatite, monazite, pyrite, magnetite, calcite, anatase , and rutile.
McCrone discovered that the Vinland Map, purporting to show that Leif Ericson had visited America some five centuries before Columbus, had traces of anatase , a pigment not synthesized until about 1920.
Small well-developed brown anatase crystals replacing larger titanite crystals have been collected from Corral Canyon, Churchill County, Nevada.
Similar though typically smaller anatase crystals were found with secondary copper and zinc minerals at the Eldorado mine, Montgomery County, and with quartz in Alexander County.
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