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

Photo: 2006 M. Kampf
Latitude: 23°36'16"N
Longitude: 36°11'42"E
 
 
Quaternary volcanic island, 3 x 2 km in size, 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.
Largest of a group of islands in Foul Bay; located 46 km southeast of Ras Banas.

Note: The island is part of the Elba National Park.

Presence of spinel-lherzolites with anhydrous Al-diopside pyroxenites and hydrous Cr-diopside pyroxenites layers.
In the 19th century, geologists re-explored old mines and found interesting nickel deposits, which were later mined in the Nasser era around 1960.

Mineral List

Actinolite
'Albite-Anorthite Series'
'Apatite'
Brochantite ?
'Clinopyroxene Subgroup'
Davyne
Forsterite
var: Peridot
Hercynite
var: Picotite

Ilmenite
Kaersutite
Langite
Lizardite
Magnesio-hornblende
Magnesite
Magnetite
var: Titaniferous Magnetite

'Orthopyroxene Subgroup'
Pargasite
Phlogopite
Spinel
Tremolite


21 entries listed. 14 valid minerals.

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References

- Wilson, W. (1976): Famous Mineral Localities: Saint John's Island, Egypt. Mineralogical Record 7 (6), 310-314.
- Gübelin, E. (1980): 'Seberged, die Peridot-Insel im Roten Meer'. Lapis, 5 (11), 19-26.
- Kurat, G., Niedermayr, G. & Prinz, M. (1982): Peridot von Zabargad, Rotes Meer. Aufschluss, 33 (5), 169-182.
- KURAT, G., H. PALME, A. EMBEY-ISZTIN, J. TOURET, T. NTAFLOS, B. SPETTEL, F. BRANDSTÄTTER, G. DREIBUS, and M. PRINZ (1993): Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt. Mineral. Petrol. 48, 309-341.


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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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