Like aurichalcite, rosasite is a zinc copper hydroxycarbonate mineral, but the chemical formula is slightly different ((Cu,Zn)2CO3(OH)2).  Rosasite tends to form turqoise-colored, subrounded masses of tiny crystals.


Rosasite clusters (pale blue) on iron hydroxy-oxide gossan matrix (field of view ~3.5 cm across), from an oxidized carbonate replacement deposit at the Ojuela Mine, Mapimí, northeastern Durango State, northern Mexico.



Rosasite (field of view ~1.6 cm across)



Photo gallery of rosasite



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