A mineral, dark reddish-brown to black in colour and typically occurring as small prismatic crystals and as crusts on lead ores.
A basic vanadate of lead and zinc, PbZn(VO₄)(OH). Crystal system: orthorhombic.
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From French descloizite from the name of Alfred Des Cloizeaux, French mineralogist + -ite.