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Tephroite: Mn2SiO4
Comments: Sharp crystals of tephroite to 1.2 cm across. Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: Picture size 5 cm. © John Veevaert
Tephroite: Mn2SiO4 Ericssonite: BaMn++2Fe+++O[Si2O7](OH) Orthoericssonite: BaMn2(Fe+++O)Si2O7(OH)
Comments: Dark brown ericssonite, intergrown with orthoericssonite, with pink rhodonite, light brown diopside (var. schefferite) and gray tephroite. Location: Langban, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Tephroite: Mn2SiO4 Johnbaumite: Ca5(AsO4)3(OH)
Comments: Violet crystalline massive johnbaumite with brown tephroite. Location: Jacobsberg, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species