Cornerupina Kornerupine, sometimes referred to as prismatine, is a rare gemstone first discovered in Greenland named after the Danish explorer Andreas Nikolaus Kornerup. Kornerupine occurs in variety of colors, including white, pink, yellow, brown, green and blue. Kornerupine typically exhibits strong pleochroism, usually from yellowish green to reddish brown. Kornerupine has a hardness of 6.5 to 7 on the Mohs scale and is hard enough for jewelry, but owing to its rarity, it is mainly a collector's stone.
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