Aurichalcite is a scarce zinc copper hydroxycarbonate mineral ((Zn,Cu)5(CO3)2(OH)6).  It has a nonmetallic luster, a robin's egg blue color, and tends to form small, delicate needle-like crystals.


Aurichalcite needles in a vug of iron hydroxy-oxide gossan (field of view ~3.4 cm across) from an oxidized carbonate replacement deposit at the Ojuela Mine, Mapimí, northeastern Durango State, northern Mexico.



Photo gallery of aurichalcite



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