...Kurt Krenn; Jürgen Konzett; Roland Stalder ABSTRACT Fluid inclusions trapped in quartz, beryl, and cassiterite from a granitic pegmatite of the Austroalpine basement of the Eastern Alps in Northern Italy were analyzed using a cooling/heating stage and micro-Raman spectroscopy with the following...

... in Å ( I ) hkl ] are: 2.5534 (100) 051, 3.9508 (85) 220, 2.9236 (78) 122, 4.1783 (61) 211, 2.4307 (55) 012, 2.0198 (39) 152, 1.8995 (30) 342, 6.294 (28) 101. The most common associated minerals are quartz, albite, microcline, and apatite. Beryl and, in places, schorl are also found as primary pegmatitic...

...Aaron C. Palke; Lawrence M. Henling; Chi Ma; George R. Rossman; Ziyin Sun; Nathan Renfro; Anthony R. Kampf; Kyaw Thu; Nay Myo; Patcharee Wongrawang; Vararut Weeramonkhonlert Abstract A new mineral of the beryl group, johnkoivulaite, Cs(Be 2 B)Mg 2 Si 6 O 18 , was recovered from the gem gravels...

..., Scheibengraben and Bienergraben beryl–columbite pegmatites in the Maršíkov District (Silesian Unit, Bohemian Massif, Czech Republic). Textural and compositional variations of microlite-group minerals were examined using electron probe micro-analyses and microRaman spectroscopy (μRS). A complex post-magmatic...

...Rhiana E. Henry; Lee A. Groat; R. James Evans; Jan Cempírek; Radek Škoda ABSTRACT Emerald is the most well-recognized beryl (Be 3 Al 2 Si 6 O 18 ) variety, and although it has been extensively studied, a satisfactory method for quantifying the water content within the structural channels...

...Ping Wang; Thomas P. Gray; Zhe Li; Evan J.D. Anderson; Julien Allaz; Joseph R. Smyth; Alan E. Koenig; Lijian Qi; Yan Zhou; Markus B. Raschke Abstract Beryl from Xuebaoding, Sichuan Province, western China is known for its unusual tabular habit and W–Sn–Be paragenesis in a greisen-type deposit...

...Xian Wang; Jiankang Li ABSTRACT Beryl and phenakite are important industrial beryllium minerals. In the hydrous melt of the BeO–Al 2 O 3 –SiO 2 –H 2 O (BASH) system, experiments using quench-type high-temperature and high-pressure equipment have revealed that the different activities of Al 2 O 3...

..., chlorite and/or, biotite, along with several less common secondary minerals, including mainly paragonite, tourmaline, and secondary beryl. The mixture is a common product of early subsolidus hydrothermal alteration at the examined pegmatites of the beryl-columbite subtype – Věžná I and Drahonín...

...Štěpán Chládek; Pavel Uher; Milan Novák ABSTRACT We studied compositional variations in columbite group minerals (CGM) from several granitic pegmatites of the beryl-columbite subtype in the Maršíkov district, Silesian Domain of the Bohemian Massif, Czech Republic. The CGM are characterized...

...-(Y), zircon, beryl, spinel, epidote and garnet-group minerals. Oxycalciomicrolite is found as octahedral crystals, occasionally modified to rhombododecahedra, ranging from 0.2 to 0.5 mm in size. The crystals are brownish-yellow to brownish-red and translucent, with white streak and vitreous...

...Gerhard Franz; Oleksii Vyshnevskyi; Michail Taran; Vladimir Khomenko; Michael Wiedenbeck; Ferry Schiperski; Jörg Nissen Abstract We investigated emerald, the bright-green gem variety of beryl, from a new locality at Kruta Balka, Ukraine, and compare its chemical characteristics with those...

... miarolitic cavities. Montebrasite, beryl, cassiterite, almandine–spessartine series garnets, fluorapatite and columbite group species are also present. To date, schorl, lepidolite and pollucite are extremely rare. The columbite-group minerals include ferrocolumbite, manganocolumbite and ferrotapiolite...

...Lars Olov Andersson Abstract Trivalent iron ions substituting for Al 3+ are present in many beryls and are abundant in dark red and dark blue beryl. These ions do not contribute any color to the crystals. Dark blue beryl also contains octahedral Fe 2+ ions, which are involved in giving the crystal...

...Radoslaw Markus Michallik; Thomas Wagner; Osmo Tapani Rämö; Pasi Heikkilä Miarolitic pockets from the 1628 Ma Luumäki pegmatite in SE Finland contain gem-quality beryl (heliodor) within a matrix of reddish hematite, biotite, muscovite, chlorite, quartz, kaolinite, and bertrandite. Two different...

... in a beryl–columbite–phosphate rare-element pegmatite where it is commonly intergrown with triphylite–lithiophilite or sarcopside, and may form by exsolution from a high-temperature (Li,Ca)-rich graftonite-like parent phase. It occurs as pale-brown lamellae 0.1–1.5 mm wide in triphylite, and is pale brown...

... discovered in phosphate nodules of two beryl–columbite–phosphate pegmatites at Lutomia and Michałkowa, respectively, in the Góry Sowie Block, Lower Silesia, southwest Poland. Graftonite-(Mn) is pinkish brown, whereas graftonite-(Ca) shows more brownish colouration. Both minerals have a vitreous lustre...

...Raji Kurumathoor; Gerhard Franz Beryl crystals from Minas Gerais (Brazil), Lumäki (Finland), Sichuan (China), and the Himalayas have been investigated by scanning electron microscopy in order to characterize the shape of etch pits on different crystal faces. The objective was to find out whether...

... Selwyn Basin strata. Euhedral beryl crystals (<0.5 × 5 cm) are present in approximately half of the 26 outcropping veins. Most of the crystals are opaque to translucent and colorless to yellowish and grassy green. Less than 5% of the beryl is transparent, bluish green, and can be considered pale...

... ). Considerations of the chemistry of tourmaline and scapolite associated with emerald and beryl, data from fluid and solid inclusions in these minerals, thermodynamic calculations, and mineral thermobarometric data confirm that Be originated from the pegmatites, transported in a moderately saline aqueous fluid...

... crystals of emerald, green beryl, and clear beryl. Emerald occurs predominantly with abundant quartz, often in clearly defined veins ( Fig. 2 ) or vein breccia fragments. The quartz is in textural equilibrium with all emerald samples studied and the fluid inclusions hosted within the quartz and emerald...