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Comments: Black, opaque octahedral crystals of magnetite on matrix.
Location: Isle of Ischia, near Naples, Compania, Italy.
Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals
Magnetite: Fe++Fe+++2O4 Nordenskioldine: CaSnB2O6
Comments: Colorless to white bladed crystals of nordenskiöldine with black magnetite.
Location: Pöhla-Tellerhäuser Gallery, Pöhla, Schwarzenberg District, Erzgebirge, Saxony, Germany.
Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag
Magnetite: Fe++Fe+++2O4 Chesterite: (Mg,Fe++)17Si20O54(OH)6
Comments: Green platy chesterite in black, metallic magnetite.
Location: Near Missoula, Missoula County, Montana, USA.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species