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Adding complexity to the garnet supergroup: monteneveite, Ca<sub>3</sub>Sb<sup>5+</sup><sub>2</sub>(Fe<sup>3+</sup><sub>2</...

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Zeitschriftentitel: European Journal of Mineralogy
Personen und Körperschaften: Karlsson, Andreas, Holtstam, Dan, Bindi, Luca, Bonazzi, Paola, Konrad-Schmolke, Matthias
In: European Journal of Mineralogy, 32, 2020, 1, S. 77-87
Format: E-Article
Sprache: Englisch
veröffentlicht:
Copernicus GmbH
Schlagwörter:
author_facet Karlsson, Andreas
Holtstam, Dan
Bindi, Luca
Bonazzi, Paola
Konrad-Schmolke, Matthias
Karlsson, Andreas
Holtstam, Dan
Bindi, Luca
Bonazzi, Paola
Konrad-Schmolke, Matthias
author Karlsson, Andreas
Holtstam, Dan
Bindi, Luca
Bonazzi, Paola
Konrad-Schmolke, Matthias
spellingShingle Karlsson, Andreas
Holtstam, Dan
Bindi, Luca
Bonazzi, Paola
Konrad-Schmolke, Matthias
European Journal of Mineralogy
Adding complexity to the garnet supergroup: monteneveite, Ca<sub>3</sub>Sb<sup>5+</sup><sub>2</sub>(Fe<sup>3+</sup><sub>2</sub>Fe<sup>2+</sup>)O<sub>12</sub>, a new mineral from the Monteneve mine, Bolzano Province, Italy
General Medicine
author_sort karlsson, andreas
spelling Karlsson, Andreas Holtstam, Dan Bindi, Luca Bonazzi, Paola Konrad-Schmolke, Matthias 1617-4011 Copernicus GmbH General Medicine http://dx.doi.org/10.5194/ejm-32-77-2020 <jats:p>Abstract. Monteneveite, ideally Ca3Sb25+(Fe23+Fe2+)O12, is a new member of the garnet supergroup (IMA 2018-060). The mineral was discovered in a small specimen belonging to the Swedish Museum of Natural History coming from the now abandoned Monteneve Pb–Zn mine in Passiria Valley, Bolzano Province, Alto Adige (South Tyrol), Italy. The specimen consists of mainly magnetite, sphalerite, tetrahedrite-(Fe) and oxycalcioroméite. Monteneveite occurs as black, subhedral crystals with adamantine lustre. They are equidimensional and up to 400 µm in size, with a subconchoidal fracture. Monteneveite is opaque, grey in reflected light, and isotropic under crossed polars. Measured reflectance values (%) at the four COM wavelengths are 12.6 (470 nm), 12.0 (546 nm), 11.6 (589 nm) and 11.4 (650 nm). The Vickers hardness (VHN100) is 1141 kg mm−2, corresponding to H=6.5–7, and the calculated density is 4.72(1) g cm−3. A mean of 10 electron microprobe analyses gave (wt %) CaO 23.67, FeO 3.75, Fe2O3 29.54, Sb2O5 39.81, SnO2 2.22, ZnO 2.29, MgO 0.15, MnO 0.03 and CoO 0.03. The crystal chemical formula calculated on the basis of a total of eight cations and 12 anions, and taking into account the available structural and spectroscopic data, is (Ca2.97Mg0.03)Σ=3.00 (Sb1.735+Sn0.104+Fe0.173+)Σ=2.00(Fe2.433+Fe0.372+Zn0.20)Σ=3.00O12. The most significant chemical variations encountered in the sample are related to a substitution of the type YSn4++ZFe3+→YSb5++ZFe2+. Mössbauer data obtained at RT and 77 K indicate the presence of tetrahedrally coordinated Fe2+. Raman spectroscopy demonstrates that there is no measurable hydrogarnet component in monteneveite. The six strongest Bragg peaks in the powder X-ray diffraction pattern are [d (Å), I (%), (hkl)]: 4.45, 100, (220); 3.147, 60, (400); 2.814, 40, (420); 2.571, 80, (422); 1.993, 40, (620); 1.683, 60, (642). Monteneveite is cubic, space group Ia-3‾d, with a=12.6093(2) Å, V=2004.8(1) Å3, and Z=8. The crystal structure was refined up to R1=0.0197 for 305 reflections with Fo&gt;4σ(Fo) and 19 parameters. Monteneveite is related to the other Ca-, Sb- and Fe-bearing, nominally Si-free members of the bitikleite group, but it differs in that it is the only known garnet species with mixed trivalent and divalent cations (2:1) at the tetrahedral Z site. Textural and mineralogical evidence suggests that monteneveite formed during peak metamorphism (at ca. 600 ∘C) during partial breakdown of tetrahedrite-(Fe) by reactions with carbonate, under relatively oxidizing conditions. The mineral is named after the type locality, the Monteneve (Schneeberg) mine. </jats:p> Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy European Journal of Mineralogy
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title Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_unstemmed Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_full Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_fullStr Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_full_unstemmed Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_short Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_sort adding complexity to the garnet supergroup: monteneveite, ca&lt;sub&gt;3&lt;/sub&gt;sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;fe&lt;sup&gt;2+&lt;/sup&gt;)o&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the monteneve mine, bolzano province, italy
topic General Medicine
url http://dx.doi.org/10.5194/ejm-32-77-2020
publishDate 2020
physical 77-87
description <jats:p>Abstract. Monteneveite, ideally Ca3Sb25+(Fe23+Fe2+)O12, is a new member of the garnet supergroup (IMA 2018-060). The mineral was discovered in a small specimen belonging to the Swedish Museum of Natural History coming from the now abandoned Monteneve Pb–Zn mine in Passiria Valley, Bolzano Province, Alto Adige (South Tyrol), Italy. The specimen consists of mainly magnetite, sphalerite, tetrahedrite-(Fe) and oxycalcioroméite. Monteneveite occurs as black, subhedral crystals with adamantine lustre. They are equidimensional and up to 400 µm in size, with a subconchoidal fracture. Monteneveite is opaque, grey in reflected light, and isotropic under crossed polars. Measured reflectance values (%) at the four COM wavelengths are 12.6 (470 nm), 12.0 (546 nm), 11.6 (589 nm) and 11.4 (650 nm). The Vickers hardness (VHN100) is 1141 kg mm−2, corresponding to H=6.5–7, and the calculated density is 4.72(1) g cm−3. A mean of 10 electron microprobe analyses gave (wt %) CaO 23.67, FeO 3.75, Fe2O3 29.54, Sb2O5 39.81, SnO2 2.22, ZnO 2.29, MgO 0.15, MnO 0.03 and CoO 0.03. The crystal chemical formula calculated on the basis of a total of eight cations and 12 anions, and taking into account the available structural and spectroscopic data, is (Ca2.97Mg0.03)Σ=3.00 (Sb1.735+Sn0.104+Fe0.173+)Σ=2.00(Fe2.433+Fe0.372+Zn0.20)Σ=3.00O12. The most significant chemical variations encountered in the sample are related to a substitution of the type YSn4++ZFe3+→YSb5++ZFe2+. Mössbauer data obtained at RT and 77 K indicate the presence of tetrahedrally coordinated Fe2+. Raman spectroscopy demonstrates that there is no measurable hydrogarnet component in monteneveite. The six strongest Bragg peaks in the powder X-ray diffraction pattern are [d (Å), I (%), (hkl)]: 4.45, 100, (220); 3.147, 60, (400); 2.814, 40, (420); 2.571, 80, (422); 1.993, 40, (620); 1.683, 60, (642). Monteneveite is cubic, space group Ia-3‾d, with a=12.6093(2) Å, V=2004.8(1) Å3, and Z=8. The crystal structure was refined up to R1=0.0197 for 305 reflections with Fo&gt;4σ(Fo) and 19 parameters. Monteneveite is related to the other Ca-, Sb- and Fe-bearing, nominally Si-free members of the bitikleite group, but it differs in that it is the only known garnet species with mixed trivalent and divalent cations (2:1) at the tetrahedral Z site. Textural and mineralogical evidence suggests that monteneveite formed during peak metamorphism (at ca. 600 ∘C) during partial breakdown of tetrahedrite-(Fe) by reactions with carbonate, under relatively oxidizing conditions. The mineral is named after the type locality, the Monteneve (Schneeberg) mine. </jats:p>
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author Karlsson, Andreas, Holtstam, Dan, Bindi, Luca, Bonazzi, Paola, Konrad-Schmolke, Matthias
author_facet Karlsson, Andreas, Holtstam, Dan, Bindi, Luca, Bonazzi, Paola, Konrad-Schmolke, Matthias, Karlsson, Andreas, Holtstam, Dan, Bindi, Luca, Bonazzi, Paola, Konrad-Schmolke, Matthias
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description <jats:p>Abstract. Monteneveite, ideally Ca3Sb25+(Fe23+Fe2+)O12, is a new member of the garnet supergroup (IMA 2018-060). The mineral was discovered in a small specimen belonging to the Swedish Museum of Natural History coming from the now abandoned Monteneve Pb–Zn mine in Passiria Valley, Bolzano Province, Alto Adige (South Tyrol), Italy. The specimen consists of mainly magnetite, sphalerite, tetrahedrite-(Fe) and oxycalcioroméite. Monteneveite occurs as black, subhedral crystals with adamantine lustre. They are equidimensional and up to 400 µm in size, with a subconchoidal fracture. Monteneveite is opaque, grey in reflected light, and isotropic under crossed polars. Measured reflectance values (%) at the four COM wavelengths are 12.6 (470 nm), 12.0 (546 nm), 11.6 (589 nm) and 11.4 (650 nm). The Vickers hardness (VHN100) is 1141 kg mm−2, corresponding to H=6.5–7, and the calculated density is 4.72(1) g cm−3. A mean of 10 electron microprobe analyses gave (wt %) CaO 23.67, FeO 3.75, Fe2O3 29.54, Sb2O5 39.81, SnO2 2.22, ZnO 2.29, MgO 0.15, MnO 0.03 and CoO 0.03. The crystal chemical formula calculated on the basis of a total of eight cations and 12 anions, and taking into account the available structural and spectroscopic data, is (Ca2.97Mg0.03)Σ=3.00 (Sb1.735+Sn0.104+Fe0.173+)Σ=2.00(Fe2.433+Fe0.372+Zn0.20)Σ=3.00O12. The most significant chemical variations encountered in the sample are related to a substitution of the type YSn4++ZFe3+→YSb5++ZFe2+. Mössbauer data obtained at RT and 77 K indicate the presence of tetrahedrally coordinated Fe2+. Raman spectroscopy demonstrates that there is no measurable hydrogarnet component in monteneveite. The six strongest Bragg peaks in the powder X-ray diffraction pattern are [d (Å), I (%), (hkl)]: 4.45, 100, (220); 3.147, 60, (400); 2.814, 40, (420); 2.571, 80, (422); 1.993, 40, (620); 1.683, 60, (642). Monteneveite is cubic, space group Ia-3‾d, with a=12.6093(2) Å, V=2004.8(1) Å3, and Z=8. The crystal structure was refined up to R1=0.0197 for 305 reflections with Fo&gt;4σ(Fo) and 19 parameters. Monteneveite is related to the other Ca-, Sb- and Fe-bearing, nominally Si-free members of the bitikleite group, but it differs in that it is the only known garnet species with mixed trivalent and divalent cations (2:1) at the tetrahedral Z site. Textural and mineralogical evidence suggests that monteneveite formed during peak metamorphism (at ca. 600 ∘C) during partial breakdown of tetrahedrite-(Fe) by reactions with carbonate, under relatively oxidizing conditions. The mineral is named after the type locality, the Monteneve (Schneeberg) mine. </jats:p>
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spelling Karlsson, Andreas Holtstam, Dan Bindi, Luca Bonazzi, Paola Konrad-Schmolke, Matthias 1617-4011 Copernicus GmbH General Medicine http://dx.doi.org/10.5194/ejm-32-77-2020 <jats:p>Abstract. Monteneveite, ideally Ca3Sb25+(Fe23+Fe2+)O12, is a new member of the garnet supergroup (IMA 2018-060). The mineral was discovered in a small specimen belonging to the Swedish Museum of Natural History coming from the now abandoned Monteneve Pb–Zn mine in Passiria Valley, Bolzano Province, Alto Adige (South Tyrol), Italy. The specimen consists of mainly magnetite, sphalerite, tetrahedrite-(Fe) and oxycalcioroméite. Monteneveite occurs as black, subhedral crystals with adamantine lustre. They are equidimensional and up to 400 µm in size, with a subconchoidal fracture. Monteneveite is opaque, grey in reflected light, and isotropic under crossed polars. Measured reflectance values (%) at the four COM wavelengths are 12.6 (470 nm), 12.0 (546 nm), 11.6 (589 nm) and 11.4 (650 nm). The Vickers hardness (VHN100) is 1141 kg mm−2, corresponding to H=6.5–7, and the calculated density is 4.72(1) g cm−3. A mean of 10 electron microprobe analyses gave (wt %) CaO 23.67, FeO 3.75, Fe2O3 29.54, Sb2O5 39.81, SnO2 2.22, ZnO 2.29, MgO 0.15, MnO 0.03 and CoO 0.03. The crystal chemical formula calculated on the basis of a total of eight cations and 12 anions, and taking into account the available structural and spectroscopic data, is (Ca2.97Mg0.03)Σ=3.00 (Sb1.735+Sn0.104+Fe0.173+)Σ=2.00(Fe2.433+Fe0.372+Zn0.20)Σ=3.00O12. The most significant chemical variations encountered in the sample are related to a substitution of the type YSn4++ZFe3+→YSb5++ZFe2+. Mössbauer data obtained at RT and 77 K indicate the presence of tetrahedrally coordinated Fe2+. Raman spectroscopy demonstrates that there is no measurable hydrogarnet component in monteneveite. The six strongest Bragg peaks in the powder X-ray diffraction pattern are [d (Å), I (%), (hkl)]: 4.45, 100, (220); 3.147, 60, (400); 2.814, 40, (420); 2.571, 80, (422); 1.993, 40, (620); 1.683, 60, (642). Monteneveite is cubic, space group Ia-3‾d, with a=12.6093(2) Å, V=2004.8(1) Å3, and Z=8. The crystal structure was refined up to R1=0.0197 for 305 reflections with Fo&gt;4σ(Fo) and 19 parameters. Monteneveite is related to the other Ca-, Sb- and Fe-bearing, nominally Si-free members of the bitikleite group, but it differs in that it is the only known garnet species with mixed trivalent and divalent cations (2:1) at the tetrahedral Z site. Textural and mineralogical evidence suggests that monteneveite formed during peak metamorphism (at ca. 600 ∘C) during partial breakdown of tetrahedrite-(Fe) by reactions with carbonate, under relatively oxidizing conditions. The mineral is named after the type locality, the Monteneve (Schneeberg) mine. </jats:p> Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy European Journal of Mineralogy
spellingShingle Karlsson, Andreas, Holtstam, Dan, Bindi, Luca, Bonazzi, Paola, Konrad-Schmolke, Matthias, European Journal of Mineralogy, Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy, General Medicine
title Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_full Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_fullStr Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_full_unstemmed Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_short Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
title_sort adding complexity to the garnet supergroup: monteneveite, ca&lt;sub&gt;3&lt;/sub&gt;sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;fe&lt;sup&gt;2+&lt;/sup&gt;)o&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the monteneve mine, bolzano province, italy
title_unstemmed Adding complexity to the garnet supergroup: monteneveite, Ca&lt;sub&gt;3&lt;/sub&gt;Sb&lt;sup&gt;5+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;(Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;Fe&lt;sup&gt;2+&lt;/sup&gt;)O&lt;sub&gt;12&lt;/sub&gt;, a new mineral from the Monteneve mine, Bolzano Province, Italy
topic General Medicine
url http://dx.doi.org/10.5194/ejm-32-77-2020