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Decrespignyite-(Y): (Y,REE)4Cu(CO3)4Cl(OH)5·2(H2O)
Comments: Blue, rounded aggregates of decrespignyite-(Y) on matrix. Location: Paratoo copper mine, Yunta, Olary Province, South Australia, Australia. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag