...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...

... °C for the higher temperature phase transition. §   Corresponding author e-mail address : marshall@sfu.ca 5 December 2016 14 June 2017 © 2017 Mineralogical Association of Canada 2017 fluid inclusions emerald beryl stable isotopes Alps Switzerland...

... localities ( Table 3 ), and agrees with the structural formula (based on 25 oxygen atoms). The rare beryllium mineral bavenite, (Ca 4 [(Al,Be) 4 (Si 9 (O,OH) 26-n ] (OH) 2+n ), occurs in granite pegmatites, usually as an alteration product of beryl or bertrandite. The type locality is the Montecatini...

... concentrations. The granites exhibit a light pink colour and contain mainly albite, quartz, muscovite, lithian muscovite, and lepidolite, with minor amounts of amblygonite–montebrasite, herderite, fluorapatite, topaz, and cassiterite, as well as accessory beryl and goyazite. Electron microprobe analyses...

... the feldspar, quartz, and sericite. This mineral assemblage is, in part, the result of the alkaline nature of the melt that leads to the formation of helvine-group minerals rather than beryl. The epitaxial overgrowths of genthelvite on danalite are particularly unusual because these two minerals do not coexist...

... pegmatite. The core zones consist of meter-sized masses of blocky K-feldspar and/or quartz with a more evolved assemblage of finer-grained irregular pods consisting of albite, muscovite, lepidolite, Li-tourmaline, Li-Al and Fe-Mn-phosphates, Sn-, Nb-, and Ta-oxides, beryl and Cs-beryl, spodumene, petalite...

..., up to ∼5 cm in size, from a graphic unit are completely replaced by a fine-grained mixture of muscovite, chlorite, minor K-feldspar, albite, calcite, and rare secondary beryl; (2) columnar to conic subhedral crystals and irregular grains, up to 6 cm in size, of grey-violet to brownish sekaninaite II...

... chemical analyses were performed on six samples of a rare red variety of beryl, using a standardless method (Calibration Free-LIBS) for quantitative data. Preliminary analyses by Raman spectroscopy and VIS-NIR reflectance spectroscopy showed that two of the six samples were pezzottaite. The LIBS spectra...

...-pegmatite dykes occurring in pegmatitic fields, Li mineralization associated with leucogranitic cupolas, beryl-phosphate pegmatites and quartz-montebrasite veins. The main Li minerals of these bodies include Li-mica, spodumene and/or petalite in the pegmatitic fields and leucogranitic cupolas; triphylite...

... discuss observations from natural rock suites providing tests of calculated mineral-fluid fractionation factors for N. Building on our discussion of N behavior in continental crust, we present new measurements on the N concentrations and isotopic compositions of microporous beryl and cordierite from...

...Rudolf I. Mashkovtsev; Viktor G. Thomas; Dmitry A. Fursenko; Elena S. Zhukova; Vladimir V. Uskov; Boris P. Gorshunov Abstract This paper presents the results of Fourier transform infrared (FTIR) spectroscopy of a synthetic beryl, containing D 2 O molecules in its c -axis channels, which we...

...Adam Pieczka; Eligiusz SzeŁĘg; Adam Szuszkiewicz; Bożena GOŁĘBiowska; Sylwia Zelek; Sławomir Ilnicki; Krzysztof Nejbert; Krzysztof Turniak Abstract Beryl is a common accessory mineral in the hybrid NYF + LCT Julianna pegmatite system, exposed in a quarry at Piława Górna in Lower Silesia, SW Poland...