Please use this identifier to cite or link to this item: https://ir.swu.ac.th/jspui/handle/123456789/13574
ชื่อเรื่อง: Geology, gemmological properties and preliminary heat treatment of gem-quality zircon from the central highlands of Vietnam
ผู้แต่ง: Huong L.T.-T.
Vuong B.S.
Thuyet N.T.M.
Khoi N.N.
Satitkune S.
Wanthanachaisaeng B.
Hofmeister W.
Häger T.
Hauzenberger C.
วันที่เผยแพร่: 2016
บทคัดย่อ: Gem-quality brown zircon occurs in alluvial deposits derived from Neogene- Quaternary alkali basalts in the Central Highlands of Vietnam. Rough and cut samples were characterized using standard gemmological methods, chemical analysis (electron microprobe and LA-ICP-MS), and Raman, FTIR and UVVis- NIR spectroscopy. Among the internal features observed were colour zoning and various mineral inclusions, such as apatite, ilmenite, hematite and iron hydroxide. The analysed samples contained up to 1.14 wt.% HfO2 and 0.08 wt.% total REE oxides. Darker brown stones contained greater amounts of Hf than the lighter-coloured ones. Raman and FTIR spectroscopy showed that the zircon is high-type (i.e. has high crystallinity). As with the famous Ratanakiri zircon of neighbouring Cambodia, heat treatments can be applied to dark-coloured samples to lighten the coloration in an oxidizing atmosphere or induce blue colour in reducing conditions. © 2016 The Gemmological Association of Great Britain.
URI: https://ir.swu.ac.th/jspui/handle/123456789/13574
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85010639094&doi=10.15506%2fJoG.2016.35.4.308&partnerID=40&md5=47b894259768f88ad69f661b9965a725
ISSN: 13554565
Appears in Collections:Scopus 1983-2021

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