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Ludwigite: Mg2Fe+++BO5
Comments: Limonitic matrix with blue crystals of ludwigite. Location: Simms Pass, Lemhi County, Idaho, USA. Scale: Crystal size 9 mm. © John Veevaert
Ludwigite: Mg2Fe+++BO5 Chestermanite: Mg2(Fe+++,Mg,Al,Sb+++++)BO3O2
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
Comments: Bright black, radial fibrous aggregates of ludwigite. Location: Brosso mine, Piemonte, Italy. Scale: Sample size 4x3 cm. © Sandro Maggia/Minernet.it