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Avogadrite: (K,Cs)BF4 Ferruccite: NaBF4
Comments: Very small, white crystals of ferrite on massive, yellowish avogadrite. Location: Vesuvius, Naples, Naples province, Campania, Italy. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Avogadrite: (K,Cs)BF4 Malladrite: Na2SiF6
Comments: Botryoidal pinkish-white avogadrite with yellow malladrite. Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Yellow-orange crystalline malladrite with pinkish white avogadrite. Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species