Mimetite

Mimetite – Pb5(AsO4)3Cl
Elements: Lead, Arsenic, Oxygen, Chlorine
Class: Arsenates
Crystal System: Monoclinic
Hardness: 3.5-4
Fluorite
Talc (1)Diamond (10)
Softer than glass. A steel knife scratches it.
Origin: Ojuela Mine, Mapimi – Mexico