Mineralogy of Silicate-Natrophosphate Immiscible Inclusion in Elga IIE Iron Meteorite
Rare type of silicate inclusions found in the Elga iron meteorite (group IIE) has a very specific mineral composition and shows silicate (≈90%)–natrophosphate (≈10%) liquid immiscibility due to meniscus-like isolation of Na-Ca-Mg-Fe phosphates. The 3 mm wide immiscible inclusion has been first studi...
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ftmdpi:oai:mdpi.com:/2075-163X/10/5/437/ 2023-08-20T04:10:20+02:00 Mineralogy of Silicate-Natrophosphate Immiscible Inclusion in Elga IIE Iron Meteorite Sharygin agris 2020-05-13 application/pdf https://doi.org/10.3390/min10050437 EN eng Multidisciplinary Digital Publishing Institute Mineral Geochemistry and Geochronology https://dx.doi.org/10.3390/min10050437 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 10; Issue 5; Pages: 437 silicate-natrophosphate immiscibility obertiite aenigmatite kosmochlor brianite czochralskiite marićite Elga meteorite IIE iron Yakutia Text 2020 ftmdpi https://doi.org/10.3390/min10050437 2023-07-31T23:29:50Z Rare type of silicate inclusions found in the Elga iron meteorite (group IIE) has a very specific mineral composition and shows silicate (≈90%)–natrophosphate (≈10%) liquid immiscibility due to meniscus-like isolation of Na-Ca-Mg-Fe phosphates. The 3 mm wide immiscible inclusion has been first studied in detail using optical microscopy, scanning electron microscopy, electron microprobe analysis and Raman spectroscopy. The silicate part of the inclusion contains fine-grained quartz-feldspar aggregate and mafic minerals. The relationships of feldspars indicate solid decay of initially homogenous K-Na-feldspar into albite and K-feldspar with decreasing of temperature. Some mafic minerals in the silicate part are exotic in composition: the dominant phase is an obertiite-subgroup oxyamphibole (amphibole supergroup), varying from ferri-obertiite NaNa2Mg3Fe3+Ti[Si8O22]O2 to hypothetical NaNa2Mg3Fe2+0.5Ti1.5[Si8O22]O2; minor phases are the aenigmatite-subgroup mineral (sapphirine supergroup) with composition close to median value of the Na2Fe2+5TiSi6O18O2-Na2Mg5TiSi6O18O2 join, orthopyroxene (enstatite), clinopyroxene of the diopside Ca(Mg,Fe)Si2O6–kosmochlor NaCrSi2O6-Na(Mg,Fe)0.5Ti0.5Si2O6 series and chromite. The alteration phases are represented by Fe-dominant chlorite, goethite and hydrated Na2O-rich (2.3–3.3 wt.%) Fe-phosphate close to vivianite. Natrophosphate part consists of aggregate of three orthophosphates (brianite, czochralskiite, marićite) and minor Na-Cr-Ti-clinopyroxene, pentlandite, rarely taenite. Czochralskiite Na4Ca3Mg(PO4)4 is rich in FeO (2.3–5.1 wt.%) and MnO (0.4–1.5 wt.%). Brianite Na2CaMg(PO4)2 contains FeO (3.0–4.3 wt.%) and MnO (0.3–0.7 wt.%) and marićite NaFe(PO4) bears MnO (5.5–6.2 wt.%), MgO (5.3–6.2 wt.%) and CaO (0.5–1.5 wt.%). The contact between immiscible parts is decorated by enstatite zone in the silicate part and diopside–kosmochlor clinopyroxene zone in the natrophosphate ones. The mineralogy of the studied immiscible inclusion outlines three potentially new mineral species, ... Text Yakutia MDPI Open Access Publishing Minerals 10 5 437 |
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topic |
silicate-natrophosphate immiscibility obertiite aenigmatite kosmochlor brianite czochralskiite marićite Elga meteorite IIE iron Yakutia |
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silicate-natrophosphate immiscibility obertiite aenigmatite kosmochlor brianite czochralskiite marićite Elga meteorite IIE iron Yakutia Sharygin Mineralogy of Silicate-Natrophosphate Immiscible Inclusion in Elga IIE Iron Meteorite |
topic_facet |
silicate-natrophosphate immiscibility obertiite aenigmatite kosmochlor brianite czochralskiite marićite Elga meteorite IIE iron Yakutia |
description |
Rare type of silicate inclusions found in the Elga iron meteorite (group IIE) has a very specific mineral composition and shows silicate (≈90%)–natrophosphate (≈10%) liquid immiscibility due to meniscus-like isolation of Na-Ca-Mg-Fe phosphates. The 3 mm wide immiscible inclusion has been first studied in detail using optical microscopy, scanning electron microscopy, electron microprobe analysis and Raman spectroscopy. The silicate part of the inclusion contains fine-grained quartz-feldspar aggregate and mafic minerals. The relationships of feldspars indicate solid decay of initially homogenous K-Na-feldspar into albite and K-feldspar with decreasing of temperature. Some mafic minerals in the silicate part are exotic in composition: the dominant phase is an obertiite-subgroup oxyamphibole (amphibole supergroup), varying from ferri-obertiite NaNa2Mg3Fe3+Ti[Si8O22]O2 to hypothetical NaNa2Mg3Fe2+0.5Ti1.5[Si8O22]O2; minor phases are the aenigmatite-subgroup mineral (sapphirine supergroup) with composition close to median value of the Na2Fe2+5TiSi6O18O2-Na2Mg5TiSi6O18O2 join, orthopyroxene (enstatite), clinopyroxene of the diopside Ca(Mg,Fe)Si2O6–kosmochlor NaCrSi2O6-Na(Mg,Fe)0.5Ti0.5Si2O6 series and chromite. The alteration phases are represented by Fe-dominant chlorite, goethite and hydrated Na2O-rich (2.3–3.3 wt.%) Fe-phosphate close to vivianite. Natrophosphate part consists of aggregate of three orthophosphates (brianite, czochralskiite, marićite) and minor Na-Cr-Ti-clinopyroxene, pentlandite, rarely taenite. Czochralskiite Na4Ca3Mg(PO4)4 is rich in FeO (2.3–5.1 wt.%) and MnO (0.4–1.5 wt.%). Brianite Na2CaMg(PO4)2 contains FeO (3.0–4.3 wt.%) and MnO (0.3–0.7 wt.%) and marićite NaFe(PO4) bears MnO (5.5–6.2 wt.%), MgO (5.3–6.2 wt.%) and CaO (0.5–1.5 wt.%). The contact between immiscible parts is decorated by enstatite zone in the silicate part and diopside–kosmochlor clinopyroxene zone in the natrophosphate ones. The mineralogy of the studied immiscible inclusion outlines three potentially new mineral species, ... |
format |
Text |
author |
Sharygin |
author_facet |
Sharygin |
author_sort |
Sharygin |
title |
Mineralogy of Silicate-Natrophosphate Immiscible Inclusion in Elga IIE Iron Meteorite |
title_short |
Mineralogy of Silicate-Natrophosphate Immiscible Inclusion in Elga IIE Iron Meteorite |
title_full |
Mineralogy of Silicate-Natrophosphate Immiscible Inclusion in Elga IIE Iron Meteorite |
title_fullStr |
Mineralogy of Silicate-Natrophosphate Immiscible Inclusion in Elga IIE Iron Meteorite |
title_full_unstemmed |
Mineralogy of Silicate-Natrophosphate Immiscible Inclusion in Elga IIE Iron Meteorite |
title_sort |
mineralogy of silicate-natrophosphate immiscible inclusion in elga iie iron meteorite |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2020 |
url |
https://doi.org/10.3390/min10050437 |
op_coverage |
agris |
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Yakutia |
genre_facet |
Yakutia |
op_source |
Minerals; Volume 10; Issue 5; Pages: 437 |
op_relation |
Mineral Geochemistry and Geochronology https://dx.doi.org/10.3390/min10050437 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/min10050437 |
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437 |
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