...Michael E. Fleet Abstract The structures of three B-substituted albite samples (NaBSi 3 O 8 ), including reedmergnerite from Utah and low and high synthetic boron albite, have been refined at room temperature with single-crystal X-ray intensities. For reedmergnerite, R = 0.019, the structure...

... observed greater than zero. The structure is wholly ordered, with the boron in site T 1 (O). The average Si-O distances in reedmergnerite are, T 1 (m) 1.610, T 2 (0) 1.614, T 2 (m) 1.622 Å, and the individual distances correlate closely with the corresponding ones in low albite (Ribbe et at., 1952...

...Charles Milton; E. C. T. Chao; Joseph M. Axelrod; Frank S. Grimaldi Abstract Reedmergnerite, NaBSi 3 O 8 , is a boron analogue of albite, occurring with eitelite, shortite, nahcolite, searlesite, leucosphenite, acmite, analcite, and magnesioriebeckite in unmetamorphosed dolomitic oil shales...

... containing only traces of B, will decompose in subduction zones below about 50 km depths and produce a melt with low B-contents. reedmergnerite albite experimental petrology Al-B substitution feldspar boron ordering solid solution As starting materials for the synthesis experiments we...

...F ig . 4. BSE images of the assemblage boralsilite + albite + boron mullite. (a) Albite rim around a spodumene crystal with numerous fissures of boralsilite, note late K-feldspar (bright veinlets); (b) inclusion of boralsilite in spodumene; (c) boralsilite associated with K-feldspar, note late K...

...Qi-Ming Peng; Martin R. Palmer Abstract A Paleoproterozoic sequence of metasediments and metavolcanics in Liaoning and Jilin provinces, northeast China, plays host to a large number of borate deposits that are a significant source of boron to China. The mineralogy and geochemistry of the deposits...

.... The distribution of boron between coexisting phases in the Tip Top pegmatite, South Dakota, is as follows: beryl ≈ quartz ≈ triphylite ≈ montebrasite ≈potassium feldspar < biotite < albite < muscovite < spodumene ≪ tourmaline. The bulk boron content of the Tip Top pegmatite decreases significantly...

...Roberto BRAGA; Athos CALLEGARI; Bruno MESSIGA; Luisa OTTOLINI; Maria Rosaria RENNA; Riccardo TRIBUZIO Abstract A granulite from the Sondalo femic complex, Italian Central Alps, contains prismatine, the boron-rich member of the kornerupine group. This is the first report of prismatine in the Alps...

...–Potrerillos batholith, Sierra de San Luis, Argentina. The strikingly rhythmic layers in the Zebra pegmatite consist of units of albite–K-feldspar–quartz–K-feldspar–albite, with accessory tourmaline and minor muscovite. The layers crystallized from a boron-bearing melt ponded and thermally insulated...

... and snow-like coatings on crystals of quartz, tourmaline, and feldspars from miarolitic cavities. Fragments of elbaite, danburite, and albite are included in the borocookeite mass. In some pockets, the coating is composed of borocookeite and boron-rich muscovite (or boromuscovite) which...

... per mil. The similarity between values for the tourmalinite and the Aldridge Formation suggests that the fluids which produced the tourmalinite alteration did not significantly alter the primary 18 O/ 16 O of the host sedimentary units. Isotopic values for samples from the albite-chlorite alteration...

... the alluvial and eluvial tin concentrations are of economic interest, and the largest of these is the Sinceni West deposit. Primary tin mineralization at the Sinceni West deposit consists of cassiterite in late-stage pegmatite units of sugary albite, associated with mica-tourmaline metasomatic selvages...

... plus tourmaline, and an outer zone of albite alteration consisting of albite, quartz, ferroan dolomite, and dolomite. Geochemical analyses of 355 samples show that the REE, Zr, Al 2 O 3 , TiO 2 , and Y were largely immobile during alteration and mineralization. CO 2 , K 2 O, Na 2 O, Cr 2 O 3 , Rb...

..., reedmergnerite, cesium-kupletskite, hyalotekite, albite, dusmatovite, pyrochlore, tadzhikite, tienshanite, sogdianite, stillwellite-(Ce), leucosphenite, leucophanite, willemite, danburite, zektzerite, berezanskite, baotite, cappelenite-(Y) and an unknown Y–Ca silicate. Pekovite occurs in a rock consisting mainly...

... filled by hydrothermal minerals including quartz, albite, chlorite, sericite, fluorite, hematite, and calcite. The zones of disseminated mineralization contain high abundances of miarolitic cavities and appear to reflect zones of hydrothermal fluid accumulation during crystallization. In addition...

... is important because it forms a large footprint (34 km 2 ) outside of the porphyry Cu centers. This alteration consists of epidote ± actinolite ± tourmaline veins with halos of K-feldspar–destructive albite (1–20 X An ) ± fine-grained white mica ± epidote. The distribution of sodic-calcic alteration...