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Francisite: Cu3Bi(SeO3)2O2Cl
Comments: Fine acicular crystals of green francisite to 0.1mm on matrix. Location: Iron Monarch iron mine, Iron Knob, South Australia, Australia. Scale: Picture size 1.5 cm. © Tom Loomis / Dakota Matrix
Comments: Greenish crusts of francisite on matrix. Location: Baccu Locci Mine, Villaputzu, Cagliari Province, Sardinia, Italy. Scale: Picture size 3.5 mm. © Thomas Witzke / Abraxas-Verlag