Mineral - Arsendescloizite
Arsendescloizite
Chemical Properties
Mineral Class
Arsenates
Toxicity
middle
Formula
PbZn(AsO₄)(OH)
Unit Cell
a=6.08 b=9.36 c=7.63 Z=4
Physical Properties
Hardness
4
Streak
white
Density
Very Heavy (>6)
Cleavage
Fracture
Tenacity
Brittle
Optical Properties
Color
orangeyellowgreen
Birefringence
0.045
Luster
Vitreous,
Adamantine
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-disphenoidal - 222
Space Group
P2 1 2 1 2 1 (19)
Habit
spherical, rosette, grape-shaped
Formation
In the oxidation zone of supergene, polymetallic deposits (e.g. from tennantite)
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Arsendescloizite
Composition
Elements
Mass
As₂O₅
28.11
CuO
1.76
ZnO
19.00
PbO
43.45
CaO
5.11
H₂O
2.58
China (Zhao 1985)
Groups and Members
Adelite-Descloizite-Group
Name and first discovery : Named after the French mineralogist Alfred Lewis Des Cloizeaux (1817-1897). Unlike the vanadate descloizite, arsenic descloizite contains arsenic as a cation. First described in 1979.
Chemistry :
Synonyms :
Varieties :
Abbreviation : Adcz
literature
Zhao, B. (1985). Arsendes cloizite discovered for the first time in China. Acta Mineralogica Sinica , 5 , 282-284.