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Name: Opal RRUFF ID: R070627 Ideal Chemistry: SiO2·nH2O Locality: Madagascar Source: www.multicolour.com [view label] Owner: RRUFF Description: Polished iridescent fragment, cristobalite type Status: The identification of this mineral is not yet confirmed. |
| Quick search: [ All Opal samples (7) ] | ||
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| POWDER DIFFRACTION | ||||||
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| RRUFF ID: | R070627.1 | |||||
| Sample Description: | Powder | |||||
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| REFERENCES for Opal | |
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Petruk W, Farrell D M, Laufer E E, Tremblay R J, Manning P G (1977) Nontronite and ferruginous opal from the Peace River iron deposit in Alberta, Canada, The Canadian Mineralogist, 15, 14-21 [view file] |
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Guthrie G D, Bish D L, Reynolds R C (1995) Modeling the X-ray diffraction pattern of opal-CT, American Mineralogist, 80, 869-872 [view file] |
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Nagase T, Akizuki M (1997) Texture and structure of opal-CT and opal-C in volcanic rocks, The Canadian Mineralogist, 35, 947-958 [view file] |
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Rodgers K A, Hampton W A (2003) Laser Raman identification of silica phases comprising microtextural components of sinters, Mineralogical Magazine, 67, 1-13 [view file] |
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Smith B Y, Turner S J, Rodgers K A (2003) Opal-A and associated microbes from Wairakei, New Zealand: the first 300 days, Mineralogical Magazine, 67, 563-579 [view file] |
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Ilieva A, Mihailova B, Tsintsov Z, Petrov O (2007) Structural state of microcrystalline opals: a Raman spectroscopic study, American Mineralogist, 92, 1325-1333 |
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Pewkliang B, Pring A, Brugger J (2008) The formation of precious opal: Clues from the opalization of bone, The Canadian Mineralogist, 46, 139-149 |
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