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Willemite

  • Translations : Willemiet, Willemine, Willemit, Vilemitas, Виллемит, 硅锌矿, Willemita, Belgita
  • Synonym : Belgite, Hebertine, Villemite, Wilhelmite
  • Etymology : In honor to WILHELM 1st, king of the Netherlands (1772-1843).
  • Discovery: 1830 by Levy
  • Type localityFranklin, Sussex, New Jersey, USA

Exceptionally rare in carved stone. Fluorescent mineral.

To know more about mineralogy of the willemite see mindat.org->

 

Gemological data

  • Chemical formula : Zn2SiO4
  • Hardness (Mohs) : 5.5
  • Density : 3.9 - 4.2
  • Refractive index : nω = 1.691 - 1.694 nε = 1.719 - 1.725
  • Crystal system : Trigonal
  • Group : Phenakite

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