 | | Journal (article/letter/editorial) | | Eur. J. Mineral. 2004, 16, 789-799 Opals from Slovakia ("Hungarian" opals): a re-assessment of the conditions...properties are investigated: X-Ray Diffraction (opal-A), Raman spectra (main Raman peak at 437 cm-1)...to 190°C. Key-words: Slovakia, gem opal, Raman spectroscopy, oxygen isotopes, opal classification. 1....Introduction The "Hungarian" opal deposits (now in Slovakia) were the unique source of gem opal in Europe from the...to understand the formation of opal deposits. This study focuses on opal properties and its relationship |  | | Book | | outside of Romania. Rudolf Duda (1944, Vojany, Slovakia) Head of the Department of Natural History, Eastern...Poland (Ewa Kos/.owska) Romania (Gheorghe Udubasa) Slovakia (Rudolf Duda) Ukraine (Orest Matkovs'ky) 31 31...(Ewa Kos/.owska). Romania (Gheorghe Udubasa), Slovakia (Rudolf Duda). Ukraine (Victor Kvasnytsya) 127...Czech Republic (Moravia) Hungary Poland Romania Slovakia Ukraine 397 397 399 409 412 419 425 References...through several countries, (i.e. the Czech Republic. Slovakia, Poland. Hungary, Ukraine, and Romania). From |  | | Journal (issue) | | Eulytine Inclusions in Manufactured Glass | Opal Doublets from Slovakia | Heated Sapphires with Unstable Colour...in the 450–500 nm region that is bounded by absorption bands in the visible region that arise from the...green regions with an edge in the yellow-green region caused by a prominent band at ~535 nm. Also present...present was a moderate band at ~665 nm (red region), a weak band at ~855 nm and a moderate band at ~980...quartz from Alpine-type veins in the Ganesh Himal region of Nepal that contained large biotite plates up |  | Gaillou, E., Fritsch, E., Aguilar-Reyes, B., Rondeau, B., Post, J., Barreau, A., Ostroumov, M. (2008) Common gem opal: An investigation of micro- to nano-structure. American Mineralogist, 93 (11) 1865-1873 doi:10.2138/am.2008.2518 | Journal (article/letter/editorial) | | Mineralogist, Volume 93, pages 1865–1873, 2008 Common gem opal: An investigation of micro- to nano-structure EloïsE...The microstructure of nearly 200 common gem opal-A and opal-CT samples from worldwide localities was investigated...market for their intrinsic body color. Common opal-AG and opal-CT are primarily built from nanograins that...~25 nm in diameter. Only opal-AN has a texture similar to that of glass. In opal-AG, nanograins arrange...layers, or in some cases, radial structures. Common opal does not diffract light because its spheres exhibit |  | | Book | | Rich/árová, BB zadná strana obálky: Drahý opál, 35mm, Dubník-Libanka, JM ,• I strana 1: Chalkopyrit, 65 mm...75 mm, Pezinok, MŠ strana 3: Drahý opál, 26mm, Dubník-Libanka, PK strana 4: Malachit, 5 mm, Ľubietová-Podlipa...Timkovi, Miroslavovi Bacherovi a Jozefovi Hauserovi (Prešov), Stanislavovi Horskému (Kežmarok), Petrovi Kotuľakovi...Východoslovenských neovulkanitov. Sekundárne minerály z ložiska Dubník opísal Alois Dubanský a z ložiska Solivar profesor...Ferihydroxylkeramohalit (= alunogén s Fea H20) Dubník 1956 Dubanský Gelnicait resp.gelnicit(= marrucciit) |  | | Book | | Enigmatic Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina: Insights...Cr-Bearing Andradite (var. Demantoid) from Dobšiná, Slovakia Reprinted from: Minerals 2019, 9, 164, doi:10...and Allan Pring A Review of the Classification of Opal with Reference to Recent New Localities Reprinted...on another occurrence of sapphires in the same region of the South Urals occurring in anorthosites (kyshtymites)...evolution of alluvial sapphires from the Orosmayo region (Jujuy Province, NW Argentina) and importantly |  | | Journal (issue) | | were combined under the jurisdiction of the U.S. District Court of New Jersey 168 PRODUCTION AND MARKETS...with the opening of a new mine in the Nova Era region and technological developments at established mines...start operations at the Kagem mine in the Kafubu District, historically Zambia’s largest source of emeralds...ultimately decided in eBay’s favor when the U.S. District Court of New York determined that the burden of...created potential for unrest in an already volatile region of the country, formulated a stimulus package (Golan |  | | Journal (issue) | | melee-size synthetic diamonds from India and China, black opal and green amber from Ethiopia, and a report on the...tourmaline or other gem minerals known from the Mahenge region. Hashmi saw only a few of the ‘Mahenge malaya’...source of facetable blue kyanite from the Himalayan region. Kyanite from the two localities is quite similar...högbomite often seen in pink spinel from the Morogoro region of Tanzania (Figure 20; see also Schmetzer and...prism spectroscope revealed transmission in the red region, extending only slightly into the orange. The stones |  | | Journal (issue) | | banks, which had been heavily invested in that region, were too preoccupied with troublesome loans in...Kong’s diamond industry.) Diamond sales in the region virtually halted because diamonds, purchased from...defect-related absorption features in the infrared region. Identification of the high-purity samples was...were used to cover as broad an emission-energy region as possible. The samples were cooled by direct...SYNTHETIC DIAMONDS FROM FRANCE In addition, the region outside the substrate “shadow” typically showed |  | | Journal (issue) | | Contributes to the mining history of Austria’s Habachtal region, which is regarded as one of the earliest emerald...features blue sapphire and peridot from the Mogok region of Myanmar. The peridot crystal and cut gem on...history of emerald mining in Austria’s Habachtal region. Our lead article by Wasura Soonthorntantikul and...into the mining history of Austria’s Habachtal region, which is considered one of the early emerald deposits...from the Baw Mar mine at Kyatpyin in the Mogok region of Myanmar. Photo by Robert Weldon/GIA. Among |  | | Book | | a/ulado nohn. fraotura lio-.' n • (ranaparan i,in opal o * llrlllo rnalállf o, muy fnarfa aobra Ion planon...(448), etc. • Yacimientos: escasos; Checoslovaquia (Dubník), islas Feroe, Estados Unidos (Nevada — Humboldt...concoidea (ancho de la foto, 72 mm); Checoslovaquia (Dubník). 2. Hialita — agregado (26 mm) sobre staffelita |
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Dubník, Červenica, Prešov District, Prešov Region, Slovakia