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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