... include all major bond lengths and angles, atomic coordinates, polyhedral volumes and distortions, and unit-cell parameters. The mineral beryl is used here to develop such a model. Beryl (Be 3 Al 2 Si 6 O 18 ) is an ideal mineral to show that predicting the crystal structure using chemistry is possible...

...Rhiana E. Henry; Lee A. Groat; R. James Evans; Jan Cempírek; Radek Škoda ABSTRACT Beryl (Be 3 Al 2 Si 6 O 18 ) is a well-known mineral, most famously in its vivid green form of emerald, but also as a range of other colors. Prominent varieties of beryl aside from emerald include aquamarine, red...

...Pavel Uher; Daniel Ozdín; Peter Bačík; Martin Števko; Martin Ondrejka; Olena Rybnikova; Štěpán Chládek; Jana Fridrichová; Jaroslav Pršek; Ľubica Puškelová Abstract The beryllium silicate minerals phenakite and bertrandite have been identified in granitic pegmatite dykes of the beryl-columbite...

.... There is a pegmatitic vein within the Hamadan garnet (± andalusite ± staurolite) schist adjacent to the Alvand Plutonic Complex (APC), south of Hamedan city (western Iran), in which large crystals of gem spodumene occur together with quartz, amazonite, beryl, tourmaline, and apatite. This spodumene-bearing pegmatite...

...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...

.... 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. Triphylite pods up to 50...

...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...