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Wohlerite: NaCa2(Zr,Nb)Si2O7(O,OH,F)2 Biotite: K(Mg,Fe++)3[AlSi3O10(OH,F)2
Comments: Prismatic wohlerite crystals with lepidomelane (Fe-rich biotite).
Location: Langevannet, Tvedalen, Telemark, Norway.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
Wohlerite: NaCa2(Zr,Nb)Si2O7(O,OH,F)2 Ferro-edenite: NaCa2Fe++5Si7AlO22(OH)2
Comments: Transparent yellow wöhlerite crystals embedded in pink feldspar and black mica matrix with black ferro-edenite (var. barkevikite).
Location: Langesundsfjorden, Sandoya Island, Porsgrunn, Norway.
Scale: Specimen Size: 5x5x3.5 cm.
© John Betts - Fine Minerals