Mineral - Vanadinite
Vanadinite
Chemical Properties
Mineral Class
Vanadates
Toxicity
low
Formula
Pb₅(VO₄)₃Cl
Unit Cell
a=10.32 c=7.34 Z=2
Physical Properties
Hardness
3
Streak
whiteyellow
Density
Very Heavy (>6)
Cleavage
Fracture
conchoidal,
uneven
Tenacity
Brittle
Optical Properties
Color
brownredorangeyellow
Birefringence
0.066
Luster
Adamantine
Transparency
translucent,
transparent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
hexagonal
Point Group
hexagonal-dipyramidal - 6/m
Space Group
P6 3 /m (176)
Habit
blocky, crusty, prismatic, pyramidal, tabular
Formation
Secondarily, in the oxidation zone of vanadium-bearing lead deposits, through the reaction of weathering lead sulfides (galena) with vanadium-rich solutions from the host rock under arid conditions.
Paragenesis
Twinning
Rarity
Common
Synonyms
Vanadinite
Composition
Elements
Mass
P₂O₅
0.30
As₂O₅
0.01
V₂O₅
19.10
PbO
78.07
CaO
0.07
Cl
2.66
O=Cl₂
0.60
Austria (Palache et al. 1952)
Groups and Members
Apatite-Supergroup
Apatite-Group