Opal R060651


Name: Opal
RRUFF ID: R060651
Ideal Chemistry: SiO2·nH2O
Locality: Mexico
Source: Gemological Institute of America 4570 [view label]
Owner: RRUFF
Description: Orange-brown glassy fragment, variety is opal-CT, based on its X-ray diffraction pattern
Status: The identification of this mineral has been confirmed by X-ray diffraction and chemical analysis
Mineral Group: [ Amorphous (18) ]
Quick search: [ All Opal samples (11) ]
CHEMISTRY 
RRUFF ID: R060651.2
Sample Description: Microprobe Fragment
Measured Chemistry: Si1.00O2 ยท 0.31H2O
Microprobe Data File: [ Download Excel File ]
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R060651
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
POWDER DIFFRACTION 
RRUFF ID: R060651.1
Sample Description: Powder
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Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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REFERENCES for Opal

Hoffmann C A S (1789) Mineralsystem des Herrn Inspektor Werners mit dessen erlaubnis herausgegeben von C A S Hoffmann, Bergmannisches Journal, 1, 369-398   [view file]

Sato M (1962) Tridymite crystals in opaline silica from Kusatsu, Gumma Prefecture, Mineralogical Journal, 3, 296-305   [view file]

Sanders J V (1975) Microstructure and crystallinity of gem opals, American Mineralogist, 60, 749-757   [view file]

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]

de Jong B H W S, van Hoek J, Veeman W S, Manson D V (1987) X-ray diffraction and 29Si magic-angle-spinning NMR of opals: incoherent long- and short-range order in opal-CT, American Mineralogist, 72, 1195-1203   [view file]

Drees L R, Wilding L P, Smeck N E, Senkayi A L (1989) Silica in soils: quartz and disordered silica polymorphs, in Minerals in Soil Environments Editor S B Weed. Soil Science Society of America Madison Wisconsin, USA 913-974

Elzea J M, Odom I E, Miles W J (1994) Distinguishing well ordered opal-CT and opal-C from high temperature cristobalite by X-ray diffraction, Analytica Chimica Acta, 286, 107-116

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]

Elzea J M, Rice S B (1996) TEM and X-ray diffraction evidence for cristobalite and tridymite stacking sequences in opal, Clays and Clay Minerals, 44, 492-500

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]

Ostrooumov M, Fritsch E, Lasnier B, Lefrant S (1999) Spectres Raman des opales : aspect diagnostique et aide à la classification, European Journal of Mineralogy, 11, 899-908

Monger H C, Kelly E F (2002) Silica minerals, in Soil Mineralogy with Environmental Applications Soil Science Society of America Madison Wisconsin, USA 611-636

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]

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]

Ilieva A, Mihailova B, Tsintsov Z, Petrov O (2007) Structural state of microcrystalline opals: a Raman spectroscopic study, American Mineralogist, 92, 1325-1333   [view file]

Pewkliang B, Pring A, Brugger J (2008) The formation of precious opal: Clues from the opalization of bone, The Canadian Mineralogist, 46, 139-149   [view file]

Othmane G, Allard T, Menguy N, Morin G, Esteve I, Fayek M, Calas G (2013) Evidence for nanocrystals of vorlanite, a rare uranate mineral, in the Nopal I low-temperature uranium deposit (Sierra Peña Blanca, Mexico), American Mineralogist, 98, 518-521

Liesegang M, Milke R (2014) Australian sedimentary opal-A and its associated minerals: Implications for natural silica sphere formation, American Mineralogist, 99, 1488

Eckert J, Gourdon O, Jacob D E, Meral C, Monteiro P J M, Vogel S C, Wirth R, Wenk H R (2015) Ordering of water in opals with different microstructures, European Journal of Mineralogy, 27, 203-213

Fritsch E, Megaw P K M, Spano T L, Chauviré B, Rondeau B, Gray M, Hainschwang T, Renfro N (2015) Green-luminescing hyalite opal from Zacatecas, Mexico, The Journal of Gemmology, 34, 490-508

Chauviré B, Rondeau B, Mangold N (2017) Near infrared signature of opal and chalcedony as a proxy for their structure and formation conditions, European Journal of Mineralogy, 29, 409-421

Martin E, Gaillou E (2018) Insight on gem opal formation in volcanic ash deposits from a supereruption: A case study through oxygen and hydrogen isotopic compostion of opals from Lake Tecopa, California, U.S.A., American Mineralogist, 103, 803-811