Scientific Name: Copper chloride hydroxide.
Chemical composition: Cu2Cl(OH)3
Colors: Bright green to black green
Hardness: 3 to 3.5
Formation: Orthorhombic crystal; Slender, prismatic form.
Principal Sources: Chile; Mexico; Utah, Nevada, USA.
Special Notes: The green color of the Statue of Liberty is due to a surface covering of atacamite.