Lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite
Lobanovite, K2Na(Embedded ImageMg2Na)Ti2(Si4O12)2O2(OH)4, is a new mineral of the astrophyllite supergroup from Mt. Yukspor, the Khibiny alkaline massif, Kola Peninsula Russia. It has been known previously under the following names: monoclinic astrophyllite, magnesium astrophyllite, magnesiumastroph...
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Online Access: | http://hdl.handle.net/2434/477492 https://doi.org/10.1180/minmag.2016.080.088 |
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ftunivmilanoair:oai:air.unimi.it:2434/477492 2024-04-21T08:06:35+00:00 Lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite E. Sokolova F. C. Hawthorne E. I. Semenov M. E. Ciriotti F. Cámara E. Sokolova F. Cámara F.C. Hawthorne E.I. Semenov M.E. Ciriotti 2017-02-13 http://hdl.handle.net/2434/477492 https://doi.org/10.1180/minmag.2016.080.088 eng eng Mineralogical Society of Great Britain info:eu-repo/semantics/altIdentifier/wos/WOS:000396518700014 volume:81 issue:1 firstpage:175 lastpage:181 numberofpages:7 journal:MINERALOGICAL MAGAZINE http://hdl.handle.net/2434/477492 doi:10.1180/minmag.2016.080.088 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85014532699 info:eu-repo/semantics/closedAccess lobanovite magnesiumastrophyllite astrophyllite supergroup chemical composition crystal-structure refinement Settore GEO/06 - Mineralogia info:eu-repo/semantics/article 2017 ftunivmilanoair https://doi.org/10.1180/minmag.2016.080.088 2024-03-27T16:40:40Z Lobanovite, K2Na(Embedded ImageMg2Na)Ti2(Si4O12)2O2(OH)4, is a new mineral of the astrophyllite supergroup from Mt. Yukspor, the Khibiny alkaline massif, Kola Peninsula Russia. It has been known previously under the following names: monoclinic astrophyllite, magnesium astrophyllite, magnesiumastrophyllite and magnesioastrophyllite but has never been formally proposed and approved as a valid mineral species by the Commission on new Minerals, Nomenclature and Classification of the International Mineralogical Association. It has now been revalidated and named lobanovite after Dr. Konstantin V. Lobanov, a prominent Russian ore geologist who worked in the Kola Peninsula for more than forty years (Nomenclature voting proposal 15-B). Lobanovite has been described from pegmatitic cavities on Mt. Yukspor where it occurs as elongated bladed crystals, up to 0.04 mm wide and 0.2 mm long, with a straw yellow to orange colour. Associated minerals are shcherbakovite, lamprophyllite, delindeite, wadeite, umbite and kostylevite. Lobanovite is biaxial (–) with refractive indices (λ = 589 nm) α = 1.658, βcalc. = 1.687, γ = 1.710; 2Vmeas. = 81.5–83°. Lobanovite is monoclinic, space group C2/m, a = 5.3327(2), b = 23.1535(9), c = 10.3775(4) Å, β = 99.615(1)°, V = 1263.3(1) Å3, Z = 2. The six strongest reflections in the powder X-ray diffraction data [d (Å), I, (hkl)] are: 3.38, 100, (003); 2.548, 90, (063); 10.1, 80, (001); 3.80, 60, (042,131); 3.079, 50, (132,062); 2.763, 90, (-171). The chemical composition of lobanovite was determined by electron-microprobe analysis and the empirical formula (K1.97Ba0.01)Σ1.98(Na0.65Ca0.14)Σ0.79(Fe2+0.18Mg2.02Na1.00Mn0.72)Σ6.92(Ti1.99Nb0.06)Σ2.05[(Si8.01Al0.06)Σ8.07O24]O2(OH)4.03F0.19 was calculated on the basis of 30.2 (O + OH + F) anions, with H2O calculated from structure refinement, Dcalc. = 3.161 g cm–3. In the structure of lobanovite, the main structural unit is the HOH block, which consists of one close-packed O (Octahedral) and two H (Heteropolyhedral) sheets. The M(1–4) octahedra form ... Article in Journal/Newspaper kola peninsula The University of Milan: Archivio Istituzionale della Ricerca (AIR) Mineralogical Magazine 81 1 175 181 |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
lobanovite magnesiumastrophyllite astrophyllite supergroup chemical composition crystal-structure refinement Settore GEO/06 - Mineralogia |
spellingShingle |
lobanovite magnesiumastrophyllite astrophyllite supergroup chemical composition crystal-structure refinement Settore GEO/06 - Mineralogia E. Sokolova F. C. Hawthorne E. I. Semenov M. E. Ciriotti F. Cámara Lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite |
topic_facet |
lobanovite magnesiumastrophyllite astrophyllite supergroup chemical composition crystal-structure refinement Settore GEO/06 - Mineralogia |
description |
Lobanovite, K2Na(Embedded ImageMg2Na)Ti2(Si4O12)2O2(OH)4, is a new mineral of the astrophyllite supergroup from Mt. Yukspor, the Khibiny alkaline massif, Kola Peninsula Russia. It has been known previously under the following names: monoclinic astrophyllite, magnesium astrophyllite, magnesiumastrophyllite and magnesioastrophyllite but has never been formally proposed and approved as a valid mineral species by the Commission on new Minerals, Nomenclature and Classification of the International Mineralogical Association. It has now been revalidated and named lobanovite after Dr. Konstantin V. Lobanov, a prominent Russian ore geologist who worked in the Kola Peninsula for more than forty years (Nomenclature voting proposal 15-B). Lobanovite has been described from pegmatitic cavities on Mt. Yukspor where it occurs as elongated bladed crystals, up to 0.04 mm wide and 0.2 mm long, with a straw yellow to orange colour. Associated minerals are shcherbakovite, lamprophyllite, delindeite, wadeite, umbite and kostylevite. Lobanovite is biaxial (–) with refractive indices (λ = 589 nm) α = 1.658, βcalc. = 1.687, γ = 1.710; 2Vmeas. = 81.5–83°. Lobanovite is monoclinic, space group C2/m, a = 5.3327(2), b = 23.1535(9), c = 10.3775(4) Å, β = 99.615(1)°, V = 1263.3(1) Å3, Z = 2. The six strongest reflections in the powder X-ray diffraction data [d (Å), I, (hkl)] are: 3.38, 100, (003); 2.548, 90, (063); 10.1, 80, (001); 3.80, 60, (042,131); 3.079, 50, (132,062); 2.763, 90, (-171). The chemical composition of lobanovite was determined by electron-microprobe analysis and the empirical formula (K1.97Ba0.01)Σ1.98(Na0.65Ca0.14)Σ0.79(Fe2+0.18Mg2.02Na1.00Mn0.72)Σ6.92(Ti1.99Nb0.06)Σ2.05[(Si8.01Al0.06)Σ8.07O24]O2(OH)4.03F0.19 was calculated on the basis of 30.2 (O + OH + F) anions, with H2O calculated from structure refinement, Dcalc. = 3.161 g cm–3. In the structure of lobanovite, the main structural unit is the HOH block, which consists of one close-packed O (Octahedral) and two H (Heteropolyhedral) sheets. The M(1–4) octahedra form ... |
author2 |
E. Sokolova F. Cámara F.C. Hawthorne E.I. Semenov M.E. Ciriotti |
format |
Article in Journal/Newspaper |
author |
E. Sokolova F. C. Hawthorne E. I. Semenov M. E. Ciriotti F. Cámara |
author_facet |
E. Sokolova F. C. Hawthorne E. I. Semenov M. E. Ciriotti F. Cámara |
author_sort |
E. Sokolova |
title |
Lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite |
title_short |
Lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite |
title_full |
Lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite |
title_fullStr |
Lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite |
title_full_unstemmed |
Lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite |
title_sort |
lobanovite, k2na(fe2+4mg2na)ti2(si4o12)2o2(oh)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite |
publisher |
Mineralogical Society of Great Britain |
publishDate |
2017 |
url |
http://hdl.handle.net/2434/477492 https://doi.org/10.1180/minmag.2016.080.088 |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000396518700014 volume:81 issue:1 firstpage:175 lastpage:181 numberofpages:7 journal:MINERALOGICAL MAGAZINE http://hdl.handle.net/2434/477492 doi:10.1180/minmag.2016.080.088 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85014532699 |
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info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1180/minmag.2016.080.088 |
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