Comparative analysis of sedimentary and volcanic precious opals from Australia

Journal of the Australian Ceramic Society

Volumn 44, Issue 2, 2008, Pages 17-22

  Smallwood, A G ^a   Thomas, P S ^a   Ray, A S ^a  

^a UNIVERSITY OF TECHNOLOGY SYDNEY   (Australia)

Author keywords

Precious opal; Scanning electron microscopy; Thermogravimetric analysis; X ray diffraction

Indexed keywords

ARTESIAN; AUSTRALIA; COMPARATIVE ANALYSIS; CRISTOBALITES; GEOLOGICAL ENVIRONMENT; INTERGROWTH; NEW SOUTH WALES; OPAL STRUCTURES; PRECIOUS OPAL; SEDIMENTARY ENVIRONMENT; SILICA STRUCTURES; SOUTH AUSTRALIA; THERMAL ANALYSIS; VOLCANIC ENVIRONMENT; XRD;

DIFFRACTION; HYDROGEOLOGY; SCANNING; SCANNING ELECTRON MICROSCOPY; SEDIMENTATION; SEDIMENTOLOGY; SILICA; SILICATE MINERALS; THERMOGRAVIMETRIC ANALYSIS; VOLCANOES; X RAY DIFFRACTION;

X RAY DIFFRACTION ANALYSIS;

EID: 70149108013     PISSN: 0004881X     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Review

References (20)

1. J. B. Jones, J. V. Sanders, and E. R. Segnit. (1964). The structure of opal. Nature 4962, pp 991.
2. P. J. Darragh, A. J. Gaskin, J. V. Sanders. (1976). Opals. Scientific American. 234/4, pp84.
3. H.J. Behr, K. Behr, J.J Watkins. (2000). Cretaceous microbes - producer of black opal at Lightning Ridge, NSW, Australia. Geological Abstracts No. 59. 15th Australian Geological Convention. Sydney July 2000.
4. S.R Pecover. (1996). A new Genetic model for the origin of precious opal. Extended Abstracts No. 43. Mesozoic geology of Eastern Australia plate conference. Geological Society of Australia. pp450-454.
5. B. Devison. (2004). The origin of precious opal - a new model. Australian Gemmologist Vol 22, No. 2. pp50-58.
6. R.K. Iler. (1979). The Chemistry of Silica, Solubility, Polymerisation, Colloid and Surface Properties, and Biochemistry. John Wiley and Sons Inc. New York.
7. L. D. Brown. (2005). Characterisation of Australian Opals. PhD Thesis University of Technology Sydney.
8. J. B. Jones, E. R. Segnit. (1971). The Nature of Opal. I. Nomenclature and Constituent Phases. Journal of the Geological Society of Australia. 18/1. pp57
9. 2O Minerals. Fortschrite der Mineralogie 52 /1. pp17-51.
10. J.G Olliver, I.J Townsend. (1993) Gemstones in Australia. Australian Gemstone Industry Council, Australian Government Publishing Service, Canberra, Australia. pp3-18.
11. L. C. Barnes, I. J. Townsend, R.S. Robertson, D.C. Scott. (1992) Opal South Australia's Gemstone. Handbook No. 5 Revised edition. Department of Mines and Energy Geological Survey of South Australia.
12. A. A. MacNevin and G. G. Holmes. (1979). Notes on Precious Opal and its Occurrence in NSW. Geological Survey Report GS 1979/268. Geological Survey of NSW. p 64.
13. I. A. Mumme, L. Seibright, R. Ball, On the Origin of Volcanic Opal from Houghlahan's Creek (near Teven). (1975). The Australian Gemmologist. Vol12. No 8. p235.
14. 27Al NMR Study of Amorphous and Paracrystalline Opals from Australia. Journal of Non-crystalline Solids 332. pp242-248.
15. R. Phillips, D.T. Griffin. (1981). Optical Mineralogy, the Non Opaque Minerals. W.H Freeman and Company. San Francisco. p326.
16. E. Fritsch, M.Ostrooumov, B. Rondeau, A. Barreau, D. Albertini, A.M. Marie, B. Lasnier, J. Wery. Mexican Gem Opals. Nano- and Microstructure, Origin of Colour, Comparison with Other Common Opals of Gemmological Significance. (2002). Australian Gemmologist. Vol 21, No. 6. pp 230.
17. P. S. Thomas, P. Šimon, A. Smallwood, A. S. Ray (2007). Estimation of the Diffusion Coefficient of Water Evolved During the Non-isothermal Dehydration of Australian Sedimentary Opal. J. Therm. Anal. Cal. Vol 88 No. 1. pp231-235.
18. A. G. Smallwood, P. S. Thomas, A. S. Ray, P. Šimon (2007). TMA and SEM characterisation of the Thermal Dehydration of Australian Sedimentary Opal. Vol 88 No. 1. pp185-188.
19. A. G. Smallwood. (1999) Chemical and Physical Evaluation of Australian Precious Opal. MSc. Thesis. University of Technology Sydney.
20. A.G. Smallwood.(2003). 35 years on a New Look at Synthetic Opal. Australian Gemmologist. Vol 21 No 11. pp438-447.