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Chestermanite: Mg2(Fe+++,Mg,Al,Sb+++++)BO3O2 Ludwigite: Mg2Fe+++BO5
Comments: Black capillary crystals of ludwigite with green inclusions of chestermanite in impure marble. Location: Near Potter Pass, Fresno County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species