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.

  • 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:

    linarite, CuPbSO4OH2

    malachite, Cu2(CO3)(OH)2

    cerussite, PbCO3

    brochantite, Cu4(SO4)(OH)6

    anglesite, PbSO4

  • 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.