Mimetite

Mimetite


Composition: Pb5(AsO4)3Cl
Crystal System : Hexagonal; Monoclinic
Lustre : Resinous
Hardness : 3.5-4.0
Specific Gravity : 7.1-7.3
References: Cook (2001)

Occurrence

  • Supergene
  • 1st Oxidation Zone
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Notable Finds

Abundant in the first oxidation zone but most notable as pseudomorphs and epimorphs, partly or wholly replaced by arsentsumebite (and sometimes bayldonite or duftite). The famous "Gem Pocket" was found in 1971 in the second oxidation zone, and is believed to have been located on 28 Level (?). It yielded gemmy, transparent, very pale-yellow prisms of mimetite, to 65 mm in length.