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St John's Island (Zagbargad; Zebirget; Topazios), Red Sea, Egypt

Quaternary volcanic island which is an ancient (1300 BC) locality of gem peridote. The Greek name of the island, Topazios, is believed to have given name to topaz.

Presence of spinel-lherzolites with anhydrous Al-diopside pyroxenites and hydrous Cr-diopside pyroxenites layers.





Mineral List:
  • Actinolite
  • 'Albite-Anorthite Series'
  • 'Apatite'
  • 'Clinopyroxene Subgroup'
  • Davyne
  • Forsterite
  • Forsterite
    var: Peridot
  • Hercynite
    var: Picotite
  • Ilmenite
  • Kaersutite
  • Magnesiohornblende
  • Magnetite
    var: Titaniferous Magnetite
  • 'Orthopyroxene Subgroup'
  • Pargasite
  • Phlogopite
  • Spinel
  • Tremolite


    17 entries listed. 10 valid minerals.

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