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Grimselite: K3Na(UO2)(CO3)3·(H2O)
Comments: Small yellow crystals of grimselite in matrix. Location: Gerstenegg/Sommerloch tunnel, Grimsel Region, Hasli Valley, Bern, Switzerland. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Comments: Bright yellow coatings and minor, small crystals of grimselite on a white quartz matrix.. Location: Gerstenegg - Sommerloch Tunnel, Grimsel, Hasli Tal, Bern, Schweiz (Switzerland).. Scale: See Image. © Paul M. Schumacher