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An organic compound found as brick-red smears in shale from a coal mine in Saxony, Germany. Has been identified as a mixture of two polyhydroxyanthraquinones, Graebeite-α and Graebeite-β.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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