Mimetite
Mimetite is a secondary mineral which is found in lead deposits where it forms during the oxidation process of the lead. Deposits have been found in South Africa, Namibia and Zimbabwe. Mimetite is known to be found in yellow, blue, brown and yellow mixed with orange.
Chemical Formular : Pb5(AsO4)3Cl
Refractive Index : 2.106 to 2.263.
Hardness :3½ – 4 on the Mohs Scale
Crystal System : Hexagonal