page_title: Keyite
hierarchical_section_title: Keyite
caption_attribution_description: English: Keyite Locality: Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia (Locality at mindat.org) Blue keyite on greenish adamite. Microprobed. Picture width 2 mm. Collection and photograph Christian Rewitzer Deutsch: Keyit Fundort: Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region, Namibia (Fundort bei mindat.org)
context_page_description: Keyite is a mineral with the chemical formula
  Cu²⁺
  ₃
  Zn
  ₄
  Cd
  ₂₆ · 2
  H
  ₂O. The name comes from Charles Locke Key, an American mineral dealer who furnished its first specimens.
  Keyite is monoclinic-prismatic, meaning its crystal form has three unequal axes, two of which have 90° angles between them and one with an angle less than 90°.
  Keyite belongs to the biaxial optical class, meaning it has more than one axis of anisotropy, in which light travels with zero birefringence, and three indices of refraction, nα = 1.800, nβ, and nγ = 1.870. Being a very rare cadmium copper arsenate, keyite is only found in Tsumeb, Namibia in the Tsumeb mine, a world-famous copper mine known for its abundance of rare and unusual minerals.
context_section_description: Keyite is a mineral with the chemical formula 
  Cu²⁺
  ₃
  Zn
  ₄
  Cd
  ₂(As
  O
  ₄)₆ · 2
  H
  ₂O. The name comes from Charles Locke Key (born 1935), an American mineral dealer who furnished its first specimens.
  Keyite is monoclinic-prismatic, meaning its crystal form has three unequal axes, two of which have 90° angles between them and one with an angle less than 90°.
  Keyite belongs to the biaxial optical class, meaning it has more than one axis of anisotropy (optic axis), in which light travels with zero birefringence, and three indices of refraction, nα = 1.800, nβ, and nγ  = 1.870. Being a very rare cadmium copper arsenate, keyite is only found in Tsumeb, Namibia in the Tsumeb mine, a world-famous copper mine known for its abundance of rare and unusual minerals.
caption: Keyite on adamite (greenish)
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