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| : P . d'Hanens, J . De Groeflaan 3/B 2 te 2620 Hemiksem ; tel . 031/87 94 27 . Omslagfoto MATRAS H...99-100 Sulphur in pyrite crystal-shaped cavities in quartz . 100-101 Pyrrhutite nodules Erom Texas Golf Coast... d'Hanens, J . De Greoflaan 3, bus 2 , 3-2620 Hemiksem . Tel . 031/B7 54 27 . Verzending Ueonieuws |
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| 031/707 CD ❑ 7 . 3JiALI'J11t0J . d'Hannns , Hemiksem . 0-27E0 Sint-ERillis-Waas , : op P .R . 000-1155095-1...Habitus1nderung im Laufe des Kristall wachturns . Des quartz à pétr ❑ le . Belg . ver . Ceol . 89 (2), 63-66 |
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| Mineralo „° 506, dec 197 9 17-21 Liants af Lno quartz iurld . 51-54/75 Iiulfenite . Minurolier lni :noin...lefla;, J . )n ' roofl :uan 3, Dus 2 , 2-21320 Hemiksem . Tel . 031/57 'J4 27 . : g eur . E . Op de |
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| cultured pearl • Quartz crystal with “lizard” inclusion • Unusual mottled pink quartz • Quartzite dyed...• Mogok update • “Star” obsidian • Unusual star quartz • Star sunstone from Tanzania • More from Tucson...last. For diamagnetic minerals (e.g., diamond, quartz, feldspar), magnetic susceptibility is negative...fluorite (CaF2), halite (NaCl), cuprite (CuO), quartz (SiO2), feldspars, and some other minerals. Most...produced and marketed by Kuwayama Europe of Antwerp, Belgium, and its U.S. affiliate, Elara Diamond U.S |
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| India • Tenebrescent scapolite from Afghanistan • Quartz with gilalite inclusions • Fake aquamarine crystals...from Mogok • More faked inclusions in Brazilian quartz • Natural pearl with “orient-like” coating • Fibrolite...were being sold through offices in Luanda and Antwerp. The CSO reportedly bought some $600 million of...GEMOLOGY FALL 2005 created joint ventures with Antwerp or Israeli manufacturers); and it did not include... BHP Diamonds, which opened a sales office in Antwerp, run in cooperation with rough diamond dealer IDH |
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| Lab Notes • Bromellite • Charoite inclusions in a quartz-feldspar rock • Altered vs. natural inclusions...industry. Vartkess Knadjian Backes & Strauss Antwerp, Belgium Mr. Liddicoat’s lifelong devotion to gemology...through the BHP Diamonds Inc. sales office in Antwerp, Belgium. A sorting and valuation facility, located...Organisation). The remaining 55% is sold through the Antwerp office to international manufacturers and traders...traders. Currently, most of the sales from the Antwerp office are made in broad assortments to a limited |
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| benitoite in a thin section from Owithe Valley, Belgium (Petrov, 1995). Lonsdale et al. (1931) tentatively...aegerine-augite, and titanite, with or without stilpnomelane, quartz, K-feldspar, epidote, and apatite. Benitoite is...no gangue minerals except for minor amounts of quartz locally (there is no albite). Benitoite forms pale...than sunstone and other feldspars, and softer than quartz and tourmaline. Benitoite can be oriented so that...later granitic pegmatites, which commonly have quartz cores and outer zones of microcline feldspars. |
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| cultured pearl beads • Quartz with spessartine inclusions • Pink cat’s-eye quartz • Rhodochrosite carving...two-mica schist IV ER SH EA Thac Ba Formation: quartz-mica schist, epidote-biotite-hornblende schist...N E PALEO-MESOPROTEROZOIC Ngoi Chi Formation: quartz-biotitesillimanite-garnet schist, amphibolite,...trapiche-like bluish gray sapphire, sillimanite, and quartz. Of these mining areas, Truc Lau and Tan Huong...(LA-ICP-MS) in separating natural and synthetic quartz. Plots of Ti+Cr vs. Ga are reportedly the most |
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| horn as an amber imitation • Fake inclusions in quartz • Dyed cultured pearls fading on exposure to heat...Research and Development manager at GIA in Antwerp, Belgium. Mr. Hemphill is a research associate for...arranging and conducting observation testing in Antwerp. The authors are very appreciative of those who... closely packed aggregate of cemented, angular quartz fragments. This quartzite and other sedimentary...overlying Mazatzal Formation. Quartz deposition (colorless and smoky quartz, as well as amethyst) is thought |
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| typically associated with hydrothermal synthetic quartz and synthetic emerald. RAPID COMMUNICATIONS ________...diamond inclusion in quartz from Diamantina, Brazil • An unusual type of phenomenal quartz • A new gemstone...gemstone from Italy: “Violan quartz” • New sources of marble-hosted rubies in South Asia • Cr/V-bearing green...traditionally been associated with hydrothermal synthetic quartz and emerald. They are caused primarily by rapid...yellow sapphire, spinel, diamond, and rock crystal quartz with inclusions that strongly resembled them. Nail-head |
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| white surface contamination seen in the trade is quartz dust, which contaminates some polishing compounds...evaporates from the surface of an emerald, the 1.54-R.I. quartz dust left behind would gradually become visible...calcic plagioclase (andesine-labradorite) but no quartz. Other major constituents include amphibole, vermiculite...part of the serpentinite body are interbedded with quartz lenses that are accompanied by accumulations of...dolomitic limestones and graphitic gneisses with quartz veins and pure graphite, together with widespread |
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| comm., 1997) HRD = Hoge Raad voor Diamant, 1993, Belgium IGI = International Gemological Institute, 1997...nee- dles in quartz and tourmaline) will raise the S.G. Since samples of flawless quartz were used as...see figure 2). The first column, calculated using quartz, also includes other stones with S.G.’s in the...fewer samples (3–12 for each shape). In addition to quartz, flawless synthetic corundum was used to calculate...cultured pearls. GRC and TM QUARTZ: A Large “Crystal Ball” Rock crystal quartz should be an easy material |
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| sapphire from Australia and northern Myanmar •“Spider” quartz •Nigerian tourmaline •Langasite and a related material...Research and Development manager at GIA in Antwerp, Belgium. ACKNOWLEDGMENTS: The authors thank the following...extended area (about 15 km long) from highgrade quartz-phengitic metamorphic rocks. Largescale mining...Queensland: Ken Hunter BELGIUM Diegem: Guy Lalous. Diksmuide: Honoré Loeters. Hemiksem: Daniel De Maeght....right is tourmaline (6.3 cm across) on a matrix of quartz and cleavelandite feldspar that is attached to |
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| between natural jadeite, dyed jadeite and dyed quartz simulants. JewelSiam, Vol. 7, No. 2, pp. 60–65...chalcedony; carnelian (fragment); column 4 = amethyst, quartz, carnelian. All of these objects are finished except...also contains some minor intrusive plugs (e.g., quartz diorite), dikes, and sills, as well as some sedimentary...methods discussed above. The several varieties of quartz (amethyst, carnelian, chalcedony, and jasper) were...to cryptocrystalline fine-grained varieties of quartz that are translucent, commonly light colored with |
