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.
References:
Wilson, W. (1976): Famous Mineral Localities: Saint John's Island, Egypt. Mineralogical Record 7 (6): 310-314
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Map Reference: 23°36'16"N , 36°11'42"E
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Mineral List:17 entries listed. 10 valid minerals.
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