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Boehmite Needles in Corundum7406 viewsBoehmite needles in corundum are commonly confused with rutile silk, but are easily separated by their orientation. Exsolved boehmite unmixes in three directions parallel to the edges of the rhombohedron (three directions total, but only two in the same plane. The needles intersect at 86.1/93.9°. Boehmite needles are typically found at the junctions of crossing twin planes. (Photos by Richard Hughes)
