Atacamite

Atacamite – Cu2Cl(OH)3
Class: Halides
Crystal System: Orthorhombic
Hardness: 3-3.5
Calcite
Talc (1)Diamond (10)
A copper coin can scratch it.
Origin: Mount Gunson Copper Mine, South Australia – Australia
Did you know?

Atacamite is named for Chile's bone-dry Atacama Desert, yet it also turns up in living flesh. The bloodworm grows its venomous fangs out of this copper mineral, tipping its jaws with metal hard enough to pierce a crab.