• Chemistry: (Cu, Zn)5(SO4)2(OH)6 - 6H2O, Hydrated Copper Zinc Sulfate Hydroxide.
  • Class: Sulfates.
  • Uses: As a very minor ore of copper and zinc and as mineral specimens.
  • Specimens

Ktenasite is a rare mineral from the classic mineral site at Laurium, Attiki, Greece. Ktenasite is a colorful mineral. It is often associated with other colorful minerals such as serpierite, glaucocerinite and smithsonite. Ktenasite forms crusts of lovely blue-green aggregates and tiny crystal rosettes adorning other minerals. Ktenasite forms as the result of the oxidation of copper and zinc sulfide minerals.


  • Color is blue-green to green.
  • Luster is vitreous.
  • Transparency: Specimens are translucent to transparent.
  • Crystal System is monoclinic.
  • Crystal Habits include small tabular crystals that can form rosettes and encrusting masses.
  • Cleavage is poor but discernible.
  • Fracture is uneven.
  • Hardness is 2 - 2.5
  • Specific Gravity is approximately 2.9 - 3.0 (average for non-metallic minerals).
  • Streak is pale green.
  • Associated Minerals include serpierite, glaucocerinite, smithsonite, pyrite, chalcopyrite and gypsum.
  • Notable Occurrences include the Kamaresa Mine, Laurium, Attiki, Greece; Norway and in the USA at sites in Colorado as well as at Bisbee and the 79 Mine of Arizona.
  • Best Field Indicators are crystal habit, color, associations and locality.
This Site Awarded
Available KTENASITE specimens:
see this List of ALL specimens including SOLD ones


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