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Caledonite



Caledonite
CategoryMineral
Chemical formulaCu2Pb5CO3(SO4)3(OH)6
Identification
ColorBlue; Green
Crystal habittypically prismatic or tabular; radial aggregates
Crystal systemOrthorhombic
Cleavage[001] Perfect; [100] Distinct
FractureUneven
Mohs Scale hardness2.5 - 3
LusterVitreous
Refractive index1.81 - 1.90
PleochroismNone
StreakGreen-White; Blue-Green
Specific gravity5.6 - 5.8
DiaphaneityTransparent to translucent

Caledonite, whose name derives from Caledonia, the historical name of its place of discovery (Scotland), is a richly colored blue-green sulfate mineral with an orthorhombic crystal structure, commonly found in the oxidized zones of copper-lead deposits as a secondary mineral.

Additional recommended knowledge

Contents

Uses of caledonite

Caledonite is a very minor ore mineral of lead and copper, but its rarity makes its industrial use limited. Due to its occasionally striking crystals and vibrant color, however, caledonite has value as a collector's mineral.

Associated minerals

Given that caledonite is found in oxidized copper/lead deposits, it is frequently found in association with other copper and lead minerals. Frequently associated minerals include:

Alternative names

Caledonite has one major alterative name: caledonita.

Notes for identification

Caledonite's blue color is a useful indicator, but insufficient, especially since one of its associates, linarite, is a vivid blue as well. Useful tests for determining if a specimen is caledonite include its density, streak, and crystal habit.

References

  • Webmineral Listing
  • MinDat Listing
  • Mineral Galleries
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Caledonite". A list of authors is available in Wikipedia.
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