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Geochemical and petrological characterization of gem opals from Wegel Tena, W...
Gem opals from Wegel Tena, Wollo Province, Ethiopia, occur in Oligocene rhyolitic ignimbrites. They display a unique geochemistry, with some samples yielding the... -
L'apport de recherches géomorphologiques et micromorphologiques récentes à l'...
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