Vranaite, ideally Al16S4Si4O38, a new mineral related to boralsilite, Al16B6Si2O37, from the Manjaka pegmatite, Sahatany Valley, Madagascar

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F16%3A00088762" target="_blank" >RIV/00216224:14310/16:00088762 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.2138/am-2016-5686" target="_blank" >http://dx.doi.org/10.2138/am-2016-5686</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2138/am-2016-5686" target="_blank" >10.2138/am-2016-5686</a>

Result language
angličtina
Original language name
Vranaite, ideally Al16S4Si4O38, a new mineral related to boralsilite, Al16B6Si2O37, from the Manjaka pegmatite, Sahatany Valley, Madagascar
Original language description
The system B2O3-Al2O3-SiO2 (BAS) includes two ternary phases occurring naturally, boromullite, Al9BSi2O19, and boralsilite, Al46B6Si2O37, as well as synthetic compounds structurally related to mullite. The new mineral vranaite, a third naturally occurring anhydrous ternary BAS phase, is found with albite and K-feldspar as a breakdown product of spodumene in the elbaite-subtype Manjaka granitic pegmatite, Sahatany Valley, Madagascar. Boralsilite also occurs in this association, although separately from vrnnaite; both minerals form rare aggregates of subparallel prisms up to 100 p.m long. Vranaite is monoclinic, space group 121m, a= 10.3832(12), b= 5.6682(7), c= 10.8228(12) angstrom, beta = 90.106(11)degrees; V= 636.97(13) angstrom(3), Z= 1. In the structure [R-1, = 0.0416 for 550 F-o> 4 sigma F-o], chains of A106 octahedra run parallel to [010] and are cross-linked by Si207 disilicate groups, B03 triangles, and clusters of A104 and two A105 polyhedra.
Czech name
—
Czech description
—

Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DB - Geology and mineralogy
OECD FORD branch
—

Project
<a href="/en/project/GA14-13347S" target="_blank" >GA14-13347S: Variability of light elements (Li, Be, B) in selected rock-forming and accessory minerals from felsic magmatic and metamorphic rocks</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)