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Aurichalcite
Chemical Formula	(Zn,Cu)5[(OH)3|CO3]2
Species	Carbonates
Crystal System	Monoclinic
Mohs Scale	1-2
Specific Gravity	3.96
Color	Pale green, greenish blue, sky-blue; colorless to pale blue, pale green in transmitted light
Streak	Light blue
Luster	Silky, Pearly
Refractive Index	n = 1.655 n = 1.740 n = 1.744
Diaphaneity	Transparent
Cleavage	PerfectPerfect on and .
Fracture	Irregular/Uneven
Crystal Habit：Typically in tufted divergent sprays or spherical aggregates, may be in thick crusts; rarely columnar, laminated or granular
Geological Setting：A secondary mineral in oxidized copper and zinc ore deposits, typically as crusts.

Aurichalcite is a carbonate mineral, usually found as a secondary mineral in copper and zinc deposits. Its chemical formula is (Zn,Cu)₅(CO₃)₂(OH)₆. The zinc to copper ratio is about 5:4.

Occurrence

Auricalcite typically occurs in the oxidized zone of copper and zinc deposits. Associated minerals include: rosasite, smithsonite, hemimorphite, hydrozincite, malachite and azurite.

It was first described in 1839 by Bottger who named the mineral for its zinc and copper content after the Greek ?ρειχαλκο?, for "mountain brass" or "mountain copper", the name of a fabulous metal. The type locality is the Loktevskoye Mine, Upper Loktevka River, Rudnyi Altai, Altaiskii Krai, Western Siberia, Russia.