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Colour:
Brownish red, red-orange, reddish brown to blackish brown, nearly black
Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy
Hardness:
3 - 3½
Specific Gravity:
6.2
Crystal System:
Orthorhombic
Member of:
Name:
Named in 1854 by Augustin Alexis Damour in honor of Alfred Louis Olivier Le Grand Des Cloizeaux [October 17, 1817, Beauvais, Oise, France - May 6, 1897, Paris, France], Professor of Mineralogy, University of Paris, who first described the mineral.
Type Locality:
Adelite-Descloizite Group.Descloizite-Mottramite Series. The zinc analogue ofMottramite, vanadate analogue ofArsendescloizite.
A secondary mineral often found in the oxidation zones of base metal deposits.
Crystal structure details (Effenberger, 2002; Qurashi and Barnes, 1964):M2 site is Zn; in opposition to adelite, there are no (M2)O6 octahedra, but ZnO4(OH)2 dipyramids, the difference being due to Jahn-Teller distortion; the dipyramids share edges to form chains; the chains are parallel to [001]; two chains are linked via a tetrahedron to form 3D framework; in the framework there are cavities where theM1 site (here: Pb) is located; Pb forms PbO7(OH) square antiprism.
A secondary mineral often found in the oxidation zones of base metal deposits.
Crystal structure details (Effenberger, 2002; Qurashi and Barnes, 1964):M2 site is Zn; in opposition to adelite, there are no (M2)O6 octahedra, but ZnO4(OH)2 dipyramids, the difference being due to Jahn-Teller distortion; the dipyramids share edges to form chains; the chains are parallel to [001]; two chains are linked via a tetrahedron to form 3D framework; in the framework there are cavities where theM1 site (here: Pb) is located; Pb forms PbO7(OH) square antiprism.
![PbZn(VO4)(OH)](#"/photo-750398.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2ff2%2fdf%2f06738700017271921209883.jpg&f=jpg&w=240" alt="06738700017271921209883.jpg" /></a><div><b>Alfred Des Cloizeaux</b></div></div></div><div><div><span>Formula:</span><div class=){kind=link}