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Hedenbergite: CaFe++Si2O6 Ilvaite: CaFe++2Fe+++Si2O7O(OH)
Comments: Doubly terminated, black ilvaite on crystals of greenish gray hedenbergite with minor galena. Location: First Sovietsky mine, Dalnjegorsk, Russia. Scale: 4 x 2.8 x 1.8 cm. © Fabre Minerals
Hedenbergite: CaFe++Si2O6
Comments: Thick, bluish gray blocky prisms of hedenbergite on matrix. Location: Harstig mine, Pajsberg, Varmland, Sweden. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals