 | | Journal (issue) | | 28 ct blue spinel, (6) 1.17 ct benitoite, (7) 2.14 ct blue sapphire, (8) 23.18 ct blue spinel, (9) 4.82...8.04 ct orange sapphire, and (18) 3.48 ct pink spinel. The necklace contains 25.85 ct of radiant-cut...Colombia), central and southern Asia (Sri Lanka, India, Afghanistan, Pakistan, Russia, and China), and...[both jadeite and nephrite], opal, peridot, quartz, spinel, tanzanite, topaz, and tourmaline). Locality information...Madagascar. Toward the end of the decade, sources in India (both in Orissa and Andhra Pradesh) provided new |  | | Journal (issue) | | areas in East Africa producing ruby, sapphire, spinel, garnets, tourmaline, chrome diopside, zircon,...Italy ABSTRACT: A boule of synthetic colourless spinel, 1MgO•3.6Al2O3, produced by the Verneuil fusion...temperature variations are considered. Keywords: spinel, crystal defects, X-ray topography, Verneuil method...better quality1-2. Furthermore, the growth of spinel by the Verneuil method produces synthetic spinels...Fe3+, Cr3+ ...) ion. In fact, synthetic magnesian spinel is normally grown from MgO and Al203 oxides, whose |  | | Journal (issue) | | areas) and drainages, Pailin district, Figure 2: Distribution district, continuous lines, with with gem-barren...(blue-green) and and pleonaste pleonastespinel spinel both sapphirine (blue-green) showing prominent...Crystals range up to 6 mm across: chromian spinel, spinel and sapphirine (Figure8), 8),and andcrust-like...andcrust-like crust-like occur as inclusions (Figure spinel reaction rims are preserved on some grains. The other...colours. Note Note intergrowths of sapphire and spinel and fusion crusts on some corundums. X15. corundums |  | Giuliani, Gaston, Groat, Lee A., Marshall, Dan, Fallick, Anthony E., Branquet, Yannick (2019) Emerald Deposits: A Review and Enhanced Classification. Minerals, 9 (2) 105 doi:10.3390/min9020105 | Journal (article/letter/editorial) | | Brazil, Eastern Africa, South Africa, Madagascar, India, and Australia, and younger volcano-sedimentary...series or ophiolites in Bulgaria, Canada, China, India, Pakistan, Russia, and Spain. Colombian emerald...Torrington. China: 34. Dyaku; 35. Davdar. India: 36. Sankari Taluka; 37. Rajasthan (Bubani, Rajgarh, Kaliguman);...[18], the Muzo mine in Colombia [1], the Mohmand district in Pakistan [1], and Eidswoll in Norway [13].... etc.) Pakistan (Khaltaro) Afghanistan (Tawak) India (Rajhastan, Gubaranda) South Africa (Gravelotte) |  | | Journal (issue) | | pProminence of the Modern Diamond Cutting Industry in India Menahem Sevdermish, Alan R. Miciak, and Alfred A...Abstracts ABOUT THE COVER: Over the past 30 years, India has emerged as the dominant supplier of small cut...weight of the diamonds polished worldwide come from India. The feature article in this issue discusses India’s...spawned a growing jewelry manufacturing sector in India. However, the Indian diamond jewelery–making tradition...PROMINENCE OF THE MODERN DIAMOND CUTTING INDUSTRY IN INDIA By Menahem Sevdermish, Alan R. Miciak, and Alfred |  | | Journal (issue) | | Russia, Zambia, Zimbabwe-Sandawana, Afghanistan and India) crystalline inclusions are more frequent, but fissures...Opticon etc. This treatment, mainly practised in India, is easily visible under magnification. Emeralds...conglomerate that crops out prominently in the Peebles district of the Scottish Borders. It appears associated...69.0,69.3 68.2,70.2 Fire opal Quartz Tourmaline Spinel (natural) Sapphire, ruby Zircon (low) Spessartine...among these is taken by the Timur ruby (a rough red spinel) set on a necklace of gold, diamonds and spinels |  | | Book | | Kotlyarov Origin of Blue Sapphire in Newly Discovered Spinel–Chlorite–Muscovite Rocks within Meta-Ultramafites...ultramafites. These sapphires were formed together with a spinel–chlorite–muscovite rock during the metasomatic...A. Origin of Blue Sapphire in Newly Discovered Spinel–Chlorite–Muscovite Rocks within Meta-Ultramafites...(sulfides of Ag, Pb, Cu, and Zn) in the Charcas mining district, San Luis Potosi. The area is characterized by...metasedimentary sequence including metapelites, gneisses, and spinel and ruby-bearing marbles, which underwent granulite |  | | Journal (issue) | | Presidents Damien Cody, Australia Nirmal Kumar Bardiya, India Treasurer Marcelo Ribeiro, Brazil Secretaries Bruce...Ho, Thailand Rakesh Jain, Hong Kong Vijay Kedia, India Masaru Mizumura, Japan Alice Muthama, Kenya Stephan...reserves. Some 85% of emerald sales occur in the USA, India, Brazil, Europe, Thailand, UAE, Colombia and China...concludes. Other Aprecol Projects ● Boyacá's Art District: Joint venture with one of Colombia’s top galleries...Brazil, Eastern Africa, South Africa, Madagascar, India and Australia, and younger volcano-sedimentary series |
|
