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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
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5th European Gemmological Symposium 15-16 June 2013: Program and abstracts Naturalis
Zwaan, H..
Tipo: Book (monograph) Palavras-chave: Gemmology; Symposium; 57.49.
Ano: 2013 URL: http://www.repository.naturalis.nl/record/448764
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Gemmology, geology and origin of the Sandawana emerald deposits, Zimbabwe Naturalis
Zwaan, J.C..
As one of the most valuable gemstones, emeralds are known to occur in several countries of the world, such as Colombia, Zambia, Brazil, Pakistan, Afghanistan, Russia, Madagascar and Zimbabwe. The emerald deposits at Sandawana, Zimbabwe, are described, the emeralds from this deposit characterised and a model of emerald formation presented; this is compared with existing models. The emeralds from Sandawana, Zimbabwe, show relatively constant physical properties, with high refractive indices and specific gravities. They are characterized by laths and fibres of amphibole, both actinolite and cummingtonite. Other common inclusions are albite and apatite. Rare, opaque and chromium-rich inclusions constitute a new variety of ilmenorutile. Compared to emeralds...
Tipo: Article / Letter to the editor Palavras-chave: Emerald; Sandawana; Zimbabwe; Gemmology; Petrology; Geothermometry; Geochronology; 38.30.
Ano: 2006 URL: http://www.repository.naturalis.nl/record/209632
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