The willemite-hemimorphite relationship

  title={The willemite-hemimorphite relationship},
  author={Nicholas Markham},
Discusses factors accounting for the preferential development of willemite (rather than hemimorphite) in the oxidized zone of certain sphalerite-bearing ore deposits in South-West Africa in the light of recently published investigations of the stability of minerals in the ZnO-SiO 2 - H 2 O system. 

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