Scientific Name: Copper chloride hydroxide.

Group: Halides

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.