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Ilvaite: CaFe++2Fe+++Si2O7O(OH) Hedenbergite: CaFe++Si2O6
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
Ilvaite: CaFe++2Fe+++Si2O7O(OH) Quartz: SiO2
Comments: Black, prismatic ilvaite with quartz. Location: First Sovietskij mine, Dalnjegorsk, Russia. Scale: 3.5 x 4.5 cm. © Fabre Minerals