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Wallkilldellite: Ca4Mn++6As+++++4O16(OH)8·18(H2O)
Comments: Dark red to black tiny crystals in veins in matrix. Location: Starlera Mine, Val Ferrera, Graubünden, Switzerland. Scale: Picture Size 1 x 1.5 cm. © Diederik Visser
Wallkilldellite-(Fe): (Ca,Cu)4Fe6[(As,Si)O4]4(OH)8·18(H2O)
Comments: Brown wallkilldellite-(Fe) with reddish cuprite. Location: Roua Mine, Alpes-Maritimes, Provence-Alpes-Côte d'Azur, France. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag