Caledonite

Caledonite is named after Caledonia, the traditional name of Scotland, the country of its discovery.

Caledonite has a rich blue-green colour and high lustre. But well-developed crystals are quite rare.
General Information
Chemical Formula
Pb
 
5
Cu
 
2
(SO
 
4
)
 
3
(CO
 
3
)(OH)
 
6
Anthony et al, Handbook of mineralogy (2001)
Photos of natural/un-cut material from mindat.org
Physical Properties of Caledonite
Mohs Hardness2.5 to 3
Anthony et al, Handbook of mineralogy (2001)
Specific Gravity5.6 to 5.76
Anthony et al, Handbook of mineralogy (2001)
TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityPerfect,Imperfect
Anthony et al, Handbook of mineralogy (2001)
FractureUneven
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Caledonite
Refractive Index1.818 to 1.909
Anthony et al, Handbook of mineralogy (2001)
Optical CharacterBiaxial/-
Anthony et al, Handbook of mineralogy (2001)
PleochroismWeak
Anthony et al, Handbook of mineralogy (2001)
DispersionBarely perceptible
Anthony et al, Handbook of mineralogy (2001)
Colour
Colour (General)Deep verdigris-green, blue-green; pale bluish green in transmitted light.
Anthony et al, Handbook of mineralogy (2001)
TransparencyTransparent,Translucent
Anthony et al, Handbook of mineralogy (2001)
LustreVitreous,Resinous
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Caledonite
Crystal SystemOrthorhombic
Anthony et al, Handbook of mineralogy (2001)
HabitAs striated prismatic crystals, to 2.5 cm, typically flattened and displaying many forms. In divergent aggregates, rarely fibrous; as massive coatings.
Anthony et al, Handbook of mineralogy (2001)
Geological Environment
Where found:An uncommon secondary mineral in the oxidized portions of Pb–Cu deposits.
Anthony et al, Handbook of mineralogy (2001)
Further Information
Mineral information:Caledonite information at mindat.org
Significant Gem Localities
USA
 
  • Arizona
    • Pinal Co.
      • Mammoth Mining District
        • Tiger
          • St. Anthony deposit
  • California
    • Inyo Co.
      • Inyo Mts (Inyo Range)
        • Russ Mining District
          • Reward
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