Mineral - Descloizite
Descloizite
Chemical Properties
Mineral Class
Vanadates
Toxicity
none
Formula
Pb(Zn,Cu)[OH|VO₄]
Unit Cell
a=7.59 b=6.06 c=9.42 Z=4
Physical Properties
Hardness
3 - 3.5
Streak
brown
Density
Very Heavy (>6)
Cleavage
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
blackbrown
Birefringence
0.165
Luster
Greasy,
Adamantine
Transparency
translucent,
transparent
Pleochroism
X = Y = Gelb-Braun
Z = Braun-Schwarz
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-dipyramidal - 2/m 2/m 2/m
Space Group
Pnma (62)
Habit
leafy, prismatic, tabular
Formation
Oxidation zone of Pb-deposits
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Descloizite
Composition
Elements
Mass
SiO₂
0.02
V₂O₅
22.76
FeO
0.01
MnO
0.01
CuO
0.56
ZnO
19.21
PbO
55.47
H₂O
2.19
Namibia (Palache et al. 1952)
Groups and Members
Adelite-Descloizite-Group