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Geochemical and petrological characterization of gem opals from Wegel Tena, Wollo, Ethiopia: opal formation in an Oligocene soil
22/22 checkable references clean · checked 2026-07-23
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
9 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 22 checked references that resolve
resolves10.5741/GEMS.42.1.4
"Paraíba"-Type Copper-Bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting by LA-ICP-MS
resolves10.1127/0028-3649/2004/2004-0411
Elemental analysis of Australian amorphous banded opals by laser-ablation ICP-MS
resolves10.1127/0935-1221/2004/0016-0743
Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru
resolves10.1180/minmag.1968.283.036.02
The mineralogy of the potassium-barium feldspar series III: Subsolidus relationships
resolves10.2113/econgeo.106.1.127
Magmatic Enrichment of Uranium, Thorium, and Rare Earth Elements in Late Paleozoic Rhyolites of Southern New Brunswick, Canada: Evidence from Silicate Melt Inclusions
resolves10.1007/BF02223356
Trace elements in precious and common opals using neutron activation analysis
resolves10.1016/j.lithos.2007.05.001
Ga/Mg ratio as a new geochemical tool to differentiate magmatic from metamorphic blue sapphires
resolves10.2138/am-2004-8-918
Partitioning of Sr, Ba, Rb, Y, and LREE between alkali feldspar and peraluminous silicic magma
resolves10.1127/0935-1221/2004/0016-0789
Opals from Slovakia ("Hungarian" opals): a re-assessment of the conditions of formation
resolves10.2113/gselements.5.3.159
The Geochemistry of Gems and Its Relevance to Gemology: Different Traces, Different Prices
resolves10.1127/0077-7757/2006/0044
A SIMS study of the transition elemental distribution between bands in banded Australian sedimentary opal from the Lightning Ridge locality
resolves10.1016/0375-6742(82)90010-3
Uraniferous opal, Virgin Valley, Nevada: conditions of formation and implications for uranium exploration
The 9 references without a DOI — listed, not checked
no DOI — not checkedBarnes L.C., Towsend I.J. 1982. Opal - South Australia’s gemstone. Handbook no. 5, Department of Mines and Energy, Geological Survey of South Australia.
no DOI — not checkedFritsch E., Ostrooumov M. , et al.. 2002. Mexican gem opals: nano- and micro-structure, origin of colour, comparison with other common opals of gemmological significance. Australian Gemmologist, 21, 230–233.
no DOI — not checkedGuillong M., Meier D.L., Allan M.M., Heinrich C.A., Yardley B.W.D. 2008. Appendix A6: Sills: A Matlab-based program for the reduction of laser ablation ICP-MS data of homogeneous materials and inclusions. In: , Sylvester P. (ed.) Laser Ablation ICP-MS in the Earth Sciences: Current Practices and Outstanding Issues. Mineralogical Association of Canada, Vancouver, B.C.: Short Course Series, 40, 328–333.
no DOI — not checkedJones J.B., Segnit E.R. 1966. The occurrence and formation of opal at Coober Pedy and Andamooka. Australian Journal of Sciences, 29, 129–133.
no DOI — not checkedMazzero F., Gauthier J.-P., Rondeau B., Fritsch E., Bekele E. 2009. Nouveau gisement d’opales d’Ethiopie dans la Province du Welo: Premières informations [New deposit of Ethiopian opals in the Wollo Province: Early information]. Revue de Gemmologie a.f.g., 167, 4–5 [in French].
no DOI — not checkedPapp G., Sámson M., Jánosi M., Lovas G. 1998. Mineralogical study of wood opal from Megyaszó (NE Hungary). Topographia Mineralogica Hungariae, 3, 73–83.
no DOI — not checkedPettke T. 2008. Analytical protocols for element concentration and isotope ratio measurements in fluid inclusions by LA-(MC)-ICP-MS. In: , Sylvester P. (ed.) Laser Ablation ICP-MS in the Earth Sciences: Current Practices and Outstanding Issues. Mineralogical Association of Canada, Vancouver, B.C.: Short Course Series, 40, 189–218.
no DOI — not checkedRayot V. 1994. Altérations du centre de l’Australie: rôle des solutions salines dans la genèse des silcrètes et des profils blanchis. Mémoire n°22, Ecole des Mines de Paris.
no DOI — not checkedRondeau B., Fritsch E., Cenki-Tok B., Mazzero F. 2010b. New opals from Wollo, Ethiopia: geochemical characterization. Geochimica et Cosmochimica Acta, 74, A880.
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