Sapphires from Antsiranana province, northern Madagascar

Gems and Gemology

Volumn 36, Issue 3, 2000, Pages 216-233

  Schwarz, Dietmar ^a   Kanis, Jan ^b   Schmetzer, Karl ^b  

^a Gubelin Gem Lab   (Switzerland)

^b NONE

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0141729935     PISSN: 0016626X     EISSN: None     Source Type: Journal    
DOI: 10.5741/GEMS.36.3.216     Document Type: Article

References (58)

1. An initial appraisal of sapphire deposits located in the Antsiranana region of Northern Madagascar. (1997) Report prepared by Ransome Consulting, Cape Town, South Africa, for IMA Group s.a.r.l., 3 pp.
2. Aspen P., Upton B.G.J., Dicken A.P. (1990) Anorthoclase, sanidine and associated megacrysts in Scottish alkali basalts: High pressure syenitic debris from upper mantle sources? European Journal of Mineralogy, Vol. 2, pp. 503-517.
3. Bank H., Henn U., Milisenda C.C. (1996) Korunde aus Madagaskar. Gemmologie. Zeitschrift der Deutschen Gemmologischen Gesellschaft, Vol. 45, No. 4, p. 155.
4. Bank H., Henn U, Milisenda C.C. (1997) Saphire aus Madagaskar. Gemmologie. Zeitschrift der Deutschen Gemmologischen Gesellschaft, Vol. 46, No. 3, pp. 123-124.
5. Banker T. (1998) Madagascar mining update. ICA Gazette, November/December 1998, p. 6.
6. Besairie H. (1969) Geological Map 1:500,000, Antsiranana sheet. Service Geologique Madagasikara, Antananarivo.
7. Coenraads R.R., Sutherland F.L., Kinny P.D. (1990) The origin of sapphires: U-Pb dating of zircon inclusions sheds new light. Mineralogical Magazine, Vol. 54, pp. 113-122.
8. Coenraads R.R., Vichit P., Sutherland F.L. (1995) An unusual sapphire-zircon-magnetite xenolith from the Chanthaburi gem province, Thailand. Mineralogical Magazine, Vol. 59, pp. 465-479.
9. Coldham T. (1985) Sapphires from Australia. Gems & Gemology, Vol. 21, No. 3, pp. 130-146.
10. Coldham T. (1986) Inclusions in Australian sapphire before and after heat treatment. Australian Gemmologist, Vol. 16, pp. 122-125.
11. Gonthier E. (1997) Les saphirs du nord de Madagascar. Revue de Gemmologie A.F.G., No. 132, pp. 14-17.
12. Gübelin E.J., Koivula J.I. (1986) Photoatlas of Inclusions in Gemstones. ABC Edition, Zürich, 532 pp.
13. Gübelin E.J., Peretti A. (1997) Sapphires from the Andranondambo mine in SE Madagascar Evidence for metasomatic skarn formation. Journal of Gemmology, Vol. 25, No. 7, pp. 453-470.
14. Guo J.F., Griffin W.L., O'Reilly S.Y. (1994) A cobalt-rich spinel inclusion in a sapphire from Bo Ploi, Thailand. Mineralogical Magazine, Vol. 58, pp. 247-258.
15. Guo J.F., O'Reilly S.V., Griffin W.L. (1992) Origin of sapphire in eastern Australian basalts: Inferred from inclusion studies. Geological Society of Australia, Abstracts, Ballarat University College, No. 32, pp. 219-220.
16. Guo J.F., O'Reilly S.Y., Griffin W.L. (1996a) Corundum from basaltic terrains: A mineral inclusion approach to the enigma. Contribution to Mineralogy and Petrology, Vol. 122, No. 4, pp. 368-386.
17. Guo J.F., O'Reilly S.Y., Griffin W.L. (1996b) Zircon inclusions in corundum megacrysts: I. Trace element geochemistry and clues to the origin of corundum megacrysts in alkali basalts. Geochimica et Cosmochimica Acta, Vol. 60, No. 13, pp. 2347-2363.
18. Guo J., Wang F., Yakoumelos G. (1992) Sapphires from Changle in Shandong province, China. Gems & Gemology, Vol. 28, No. 4, pp. 255-260.
19. Holewa P. (1998) Ban Lifted in Madagascar. Gemkey, November-December 1998, p. 13.
20. Irving A.J. (1986) Polybaric magma mixing in alkali basalts and kimberlites: Evidence from corundum, zircon and ilmenite megacrysts. 4th International Kimberlite Conference, Perth, Geological Society of Australia Abstracts, Series 16, pp. 262-264.
21. Johnson M.L., Koivula J.I., McClure S.F., DeGhionno D. (1999) Gem news: Blue, pink, and purple sapphires from Ilakaka, Madagascar. Gems & Gemology, Vol. 35, No. 2, pp. 149-150.
22. Johnson M.L., Mercer M.E., Fritsch E., Maddison P., Shigley J.E. (1995) "Ti-sapphire": Czochralski-pulled synthetic pink sapphire from Union Carbide. Gems & Gemology, Vol. 31, No. 3, pp. 188-195.
23. Kanis J., Harding R.R. (1990) Gemstone prospects in Central Nigeria. Journal of Gemmology, Vol. 22, No. 4, pp. 195-202.
24. Kiefert L. (1987) Mineralogische Untersuchungen zur Charakterisierung und Unterscheidung natürlicher und synthetischer Sapphire. Diploma Thesis, University of Heidelberg, 203 pp.
25. Kiefert L., Schmelzer K. (1987) Blue and yellow sapphire from Kaduna Province, Nigeria. Journal of Gemmology, Vol. 20, No. 7/8, pp. 427-442.
26. Kiefert L., Schmetzer K. (1991) The microscopic determination of structural properties for the characterization of optical uniaxial natural and synthetic gemstones. Part 3: Examples for the applicability of structural features for the distinction of natural and synthetic sapphire, ruby, amethyst and citrine. Journal of Gemmology, Vol. 22, No. 8, pp. 471-482.
27. Kiefert L., Schmetzer K., Krzemnicki M.S., Bernhardt H.-J., Hänni H.A. (1996) Sapphires from the Andranondambo area, Madagascar. Journal of Gemmology, Vol. 25, No. 3, pp. 185-209.
28. Krzemnicki M.S., Hänni H.A., Guggenheim R., Mathys D. (1996) Investigations on sapphires from an alkali basalt, South West Rwanda. Journal of Gemmology, Vol. 25, No. 2, pp. 90-106.
29. Laurs B.M. (2000) Gem news: Update on some Madagascar gem localities. Gems & Gemology, Vol. 36, No. 2, pp. 165-167.
30. Lea R. (1998) Saphir. Exploitation interdite à la réserve spéciale d'Ambondromifehy. DMD (Dans les Media Demain), Vol. 12, No. 574, pp. 13-15.
31. Levinson A.A., Cook F.A. (1994) Gem corundum in alkali basalt: Origin and occurrence. Gems & Gemology, Vol. 30, No. 4, pp. 253-262.
32. Liddicoat R.T. Jr. (1989) Handbook of Gem Identification. GIA, Santa Monica, CA.
33. Lurie M. (1998) Madagascar ban puts sapphire ventures in limbo. Colored Stone, Vol. 11, No. 5, pp. 119, 140, 142, 143.
34. Maliková P. (1999) Origin of sapphires from the Jizerska Louka alluvial deposit in North Bohemia, Czech Republic, Europe. Australian Gemmologist, Vol. 20, No. 5, pp. 202-206.
35. McClure D.S. (1962) Optical spectra of transition-metal ions in corundum. Journal of Chemical Physics, Vol. 36, No. 10, pp. 2757-2779.
36. Milisenda C.C., Henn U. (1996) Compositional characteristics of sapphires from a new find in Madagascar. Journal of Gemmology, Vol. 25, No. 3, pp. 177-184.
37. Moon A.R., Phillips M.R. (1984) An electron microscopy study of exsolved phases in natural black Australian sapphire. Micron and Microscopica Acta, Vol. 15, No. 3, pp. 143-146.
38. Moon A.R., Phillips M.R. (1986) Inclusions in sapphire and heat treatment. Australian Gemmologist, Vol. 16, pp. 163-166.
39. Muhlmeister S., Fritsch E., Shigley J.E., Devouard B., Laurs B.M. (1998) Separating natural and synthetic rubies on the basis of trace-element chemistry. Gems & Gemology, Vol. 34, No. 2, pp. 80-101.
40. Saint-Ours J. de, Rerat J.C. (1963) Geological Map 1:100,000, sheet Montagne d'Ambre. Service Geographique à Madagascar.
41. Saint-Ours J. de, Dormois R., Rerat J.C. (1963) Geological Map 1:100,000, sheet Ambilobe-Betsiaka. Service Geographique à Madagascar.
42. Sapphire mining halted in northern Madagascar (1998) ICA Gazette, May/June, pp. 6-7.
43. Schmelzer K. (1987) Zur Deutung der Farbursache blauer Saphire - eine Diskussion. Neues Jahrbuch für Mineralogie Monatshefte, Vol. 1987, No. 8, pp. 337-343.
44. Schmelzer K. (1999a) Ruby and variously coloured sapphires from flakaka, Madagascar. Australian Gemmologist, Vol. 20, No. 7, pp. 282-284.
45. Schmetzer K. (1999b) Gem news: Twelve-rayed star sapphire from Madagascar. Gems & Gemology, Vol. 35, No. 2, pp. 148-149.
46. Schmelzer K., Bank H. (1980) Explanations of the absorption spectra of natural and synthetic Fe- and Ti-containing corundums. Neues Jahrbuch für Mineralogie Abhandlungen, Vol. 139, No. 2, pp. 216-225.
47. Schmetzer K., Bank H. (1981) The colour of natural corundum. Neues Jahrbuch für Mineralogie Monatshefte, Vol. 1981, No. 2, pp. 59-68.
48. Schmetzer K., Kiefert L. (1990) Spectroscopic evidence for heat treatment of blue sapphires from Sri Lanka - additional data. Journal of Gemmology, Vol. 22, No. 2, pp. 80-82.
49. Schwarz D., Kanis J. (1998) Madagaskar Korunde aus Nord und Süd. extraLapis, Vol. 15, pp. 60-63.
50. Schwarz D., Petsch E.J., Kanis J. (1996) Sapphires from the Andranondambo region, Madagascar. Gems & Gemology, Vol. 32, No. 2, pp. 80-99.
51. Schwarz D., Stern W.B. (2000) Chemical fingerprinting as a tool for the characterization of gem corundums from different genetic environments. Abstracts Volume (CD-ROM), 31st International Geological Congress, August 6-17, Rio de Janeiro, Brazil.
52. Smith C.P., Kammerling R.C., Keller A.S., Perelli A., Scarratt K.V., Khoa N.D., Repetto S. (1995) Sapphires from southern Vietnam. Gems & Gemology, Vol. 31, No. 3, pp. 168-186.
53. Superchi M., Donini A., Muzzioli D., Roman E. (1997) Sapphire occurrences at Ambondromifehy on the Antsiranana Province, North Madagascar. 26th International Gemmological Conference, Idar-Oberstein, Abstract Volume, pp. 62-63.
54. Sutherland F.L. (1996) Alkaline rocks and gemslones, Australia: A review and synthesis. Australian Journal of Earth Sciences, Vol. 43, pp. 323-343.
55. Sutherland F.L., Coenraads R.R. (1996) An unusual ruby-sapphire- sapphirine-spinel assemblage from the tertiary Barrington volcanic province, New South Wales, Australia. Mineralogical Magazine, Vol. 60, No. 4, pp. 623-638.
56. Sutherland F.L., Hoskin P.W.O., Fanning C.M., Coenraads R.R. (1998a) Models of corundum origin from alkali basaltic terrains: A reappraisal. Contributions to Mineralogy and Petrology, Vol. 133, No. 4, pp. 356-372.
57. Sutherland F.L., Schwarz D., Jobbins EA., Coenraads R.R., Webb G. (1998b) Distinctive gem corundum suites from discrete basalt fields: A comparative study of Barrington, Australia, and West Pailin, Cambodia, gemfields. Journal of Gemmology, Vol. 26, No. 2, pp. 65-85.
58. Thomas V.G., Mashkovtsev R.I., Smirnov S.Z., Maltsev V.S. (1997) Tairus hydrothermal synthetic sapphires doped with nickel and chromium. Gems & Gemology, Vol. 33, No. 3, pp. 188-202.