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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