tailieunhanh - Báo cáo "Characteristics of corundums from Phuoc Hiep occurrence (Quang Nam Province) "

Phuoc Hiep corundum occurrence has been discovered recently in the Central part of Vietnam (Quang Nam Province). Common protoliths in the region are high‐grade metamorphic rocks (typically of amphibolite‐granulite facies), such as garnet‐bearing amphibolites, gneisses and schists, intruded by igneous formations of different composition and age. To date, the rubies and fancy sapphires have been found in secondary, mostly alluvial deposits. The corundum crystals occur as broken, from moderate‐ to well‐rounded, fragments, but remains . | VNU Journal of Science Earth Sciences 23 2007 152-158 Characteristics of corundums from Phuoc Hiep occurrence Quang Nam Province Nguyen Ngoc Khoi Nguy Tuyet Nhung Nguyen Thi Minh Thuyet Phan Van Quynh College of Science VNU Received 24 June 2007 Abstract. Phuoc Hiep corundum occurrence has been discovered recently in the Central part of Vietnam Quang Nam Province . Common protoliths in the region are high-grade metamorphic rocks typically of amphibolite-granulite facies such as garnet-bearing amphibolites gneisses and schists intruded by igneous formations of different composition and age. To date the rubies and fancy sapphires have been found in secondary mostly alluvial deposits. The corundum crystals occur as broken from moderate- to well-rounded fragments but remains of the original habits are often present. Their size ranges from 3x5 mm to 20x30 mm sometimes to 100x120 mm. Most of corundum pieces are of purplish pink to purplish red with a small proportion of light to dark blue. For the first time the gemological characteristics of Phuoc Hiep corundums are described in detail in this paper. Common gemological properties of Phuoc Hiep corundums are normal for rubies and sapphires elsewhere in the world. The most notable features are lamellar and polysynthetic deformation twinning low transparency do to high fracturing along twinning planes color zoning and secondary fluid fingerprint inclusions. Based on the similarity in tectonic settings geological environments gemological and geochemical characteristics of corundums Phuoc Hiep occurrence can be grouped into the metapelite-hosted type of corundum deposits in Vietnam which include Tan Huong and Truc Lau deposits in the North Vietnam. Keywords Corundum Geological settings Crystallography Gemological properties Mineral assemblage. 1. Introduction Vietnam now is considered as a country with big potential for gemstones. Many kinds of gemstones have been found and mined in different areas of the country. Among .

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