Mimetite Crystal

Mimetite
Lead Arsenate Chloride, Pb5(AsO4)3Cl
Crystal System: Hexagonal
Hardness: 3.5
Density: 7.1

Mimetite is a rare secondary mineral found in the oxidized portions of lead deposits. It is typically associated with cerusite, plattnerite, wulfenite, smithsonite, hemimorphite, anglesite, limonite and other oxide zone minerals. Structurally, mimetite is a member of the apatite group; an end-member of the pyromorphite-mimetite series. It's given as belonging to the monoclinic crystal system in some references.

It occurs as colorless to yellow-brown or orange hexagonal, prismatic crystals which sometimes exhibit curved faces, and also as rounded, globular forms. Mimetite is often difficult to distiguish from pyromorphite, and in fact it's name comes from a Greek word meaning "imitator."


Rocks from D. E. Russell's Collection

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bkeller@rockhounds.com 7/24/95