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Cryptohalite: (NH4)2SiF6
Comments: White to colorless crystals of cryptohalite. The red color is due to admixtured (amorphous ?) selenium. Location: Kladno, Stredoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Cryptohalite: (NH4)2SiF6 Bararite: (NH4)2SiF6
Comments: White crystalline bararite intermixed with cryptohalite colored yellow by selenium. Location: Shamokin, Northumberland County, Pennsylvani, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species