• Chemistry: Cu3PO4(OH)3, Copper Phosphate Hydroxide.
  • Class: Phosphates
  • Uses: mineral specimens.
  • Specimens

Cornetite is a rare secondary copper mineral that is noted for its deep blue, green-blue to green color. It is found in highly weathered, oxidation zones of copper sulfide ore bodies. It has a good deep color, nice crystal forms and an attractive sparkle, all the ingredients for a popular collection mineral.


  • Color is dark blue, green-blue to green.
  • Luster is vitreous.
  • Transparency: Specimens are translucent.
  • Crystal System: is orthorhombic; 2/m2/m2/m
  • Crystal Habits include crystals that are short, rounded, nearly diamond-shaped prisms that are terminated by a dome with trapezohedral faces, also as tiny crystalline druzes, fibrous masses and crusts.
  • Cleavage is absent.
  • Fracture is uneven.
  • Hardness is 4.5
  • Specific Gravity is approximately 4.1 (above average for translucent minerals)
  • Streak is blue.
  • Associated Minerals are limonite, libethenite, malachite, pseudomalachite, brochantite and other secondary copper ore minerals.
  • Notable Occurrences include Shaba, Congo; Bwana Mkubwa, Zambia and Empire Nevada Mine, Yerington,Nevada.
  • Best Field Indicators are color, streak, crystal habits, associations and density.
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