Author: Schreyer Werner Armbruster Thomas Bernhardt Heinz-Jürgen Medenbach Olaf
Publisher: E. Schweizerbart'sche Verlagsbuchhandlung
ISSN: 0935-1221
Source: European Journal of Mineralogy, Vol.15, Iss.6, 2003-12, pp. : 1007-1018
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Abstract
Pertsevite is a new Mg borate from a contact-metasomatic kotoite marble from the region east of Verkhoyansk, SakhaYakutia, northeastern Siberia. The end member is defined as Mg2BO3F, which is the composition of a synthetic phase. The natural material consistently contains from 4 to 12 wt.% SiO2 as well as some OH. This is due to the substitutions Si + O for B + F and OH for F. A representative composition, which is an intermediate member of a solid solution series Mg2BO3(F,OH) - Mg2SiO4, has the composition (EMP data, OH calculated for charge balance) SiO2 8.25; Al2O3 0.10; B2O3 22.44; FeO 3.71; MnO 0.65; MgO 57.39; CaO 0.24; F 7.29; H2Ocalc 1.67; total 98.97 wt.%, corresponding to (Mg1.88Fe2+0.07Mn0.01)(B0.85Si0.18)O3.21F0.54(OH)0.24 or simply Mg2(B0.8Si0.2)O3.2(F,OH)0.8. A general formula of silicatian pertsevite may be given as Mg2(B,Si)O3(F,OH,O). Like the synthetic end member Mg2BO3F, silicatian pertsevite is orthorhombic, space group Pna 21, with
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