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Minerals - Mimetite | TerraCollect
Mineral - Mimetite
Mimetite
Pb₅[Cl|(AsO₄)₃]
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Chemical Properties
Mineral Class
Arsenates
Toxicity
low
Formula
Pb₅[Cl|(AsO₄)₃]
Unit Cell
a=10.25 c=7.45 Z=2
Physical Properties
Hardness
3.5 - 4
Streak
white
Density
Very Heavy (>6)
Optical Properties
Color
brown
orange
yellow
green
colorless
Birefringence
0.019
Luster
Greasy,
Adamantine,
Resinous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
Composition
Elements
Mass
Pâ‚‚Oâ‚…
0.14
Asâ‚‚Oâ‚…
23.17
PbO
74.58
Cl
2.39
O=Clâ‚‚
0.54
Pennsylvania (Palache et al. 1952)
Groups and Members
Apatite-Supergroup
Apatite-Group
Map-Layer
Geological Map
Satellite Map
Cleavage
Fracture
conchoidal,
uneven
Tenacity
Brittle
hexagonal
Point Group
hexagonal-dipyramidal - 6/m
Space Group
P6
3
/m (176)
Habit
spherical,
acicular,
prismatic,
pyramidal,
radial,
tabular,
barrel-shaped
Formation
Secondarily, through the oxidation of lead-bearing sulfide deposits (particularly galena) in the presence of arsenate-bearing solutions under arid to semi-arid conditions in the oxidation zone
Paragenesis
Twinning
Rarity
Common
Synonyms
Mimetite
