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Ferrosaponite: Ca0.3(Fe++,Mg,Fe+++)3(Si,Al)4O10(OH)2·4(H2O)
Comments: Black to greenish black balls of radiating Ferrosaponite crystals on white calcite. Location: Levoberezhye Icelandspar deposit, Nizhuyaya Tunguska river, Evenkiya, Siberia, Russia. Scale: Not Given. © Diederik Visser
Comments: Holotype specimens of earthy ferrosaponite. Location: Russia, Eastern-Siberian Region, Krasnoyarsk Territory, Evenkia, Levoberezhye Iceland Spar Deposit. Scale: FOV 6 cm. © German Type Specimen Catalogue