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Janhaugite: (Na,Ca)3(Mn++,Fe++)3(Ti++++,Zr,Nb)2Si4O15(OH,F,O)3 Dalyite: K2ZrSi6O15
Comments: Tan crystalline dalyite (arrow) with reddish brown janhaugite. Location: Gjerdingen, Nordmark, north of Oslo, Oslo, Norway. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Janhaugite: (Na,Ca)3(Mn++,Fe++)3(Ti++++,Zr,Nb)2Si4O15(OH,F,O)3
Comments: Reddish-brown columnar crystalline janhaugite in white matrix. Location: Gjerdingen, Nordmark, north of Oslo, Oslo, Norway. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species