Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup
Magnesio-lucchesiite, ideally CaMg3Al6(Si6O18)(BO3)3(OH)3O, is a new mineral species of the tourmaline supergroup. The holotype material was discovered within a lamprophyre dike that cross-cuts tourmaline-rich metapelites within the exocontact of the O'Grady Batholith, Northwest Territories (Ca...
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Mineralogical Society of America
2021
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Online Access: | http://hdl.handle.net/11573/1571893 https://doi.org/10.2138/am-2021-7496 |
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ftunivromairis:oai:iris.uniroma1.it:11573/1571893 2023-12-31T10:21:23+01:00 Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup Scribner E. D. Cempirek J. Groat L. A. James Evans R. Biagioni C. Bosi F. Dini A. Halenius U. Orlandi P. Pasero M. Scribner, E. D. Cempirek, J. Groat, L. A. James Evans, R. Biagioni, C. Bosi, F. Dini, A. Halenius, U. Orlandi, P. Pasero, M. 2021 http://hdl.handle.net/11573/1571893 https://doi.org/10.2138/am-2021-7496 eng eng Mineralogical Society of America place:Washington, DC info:eu-repo/semantics/altIdentifier/wos/WOS:000673958300002 volume:106 issue:6 firstpage:862 lastpage:871 numberofpages:10 journal:AMERICAN MINERALOGIST http://hdl.handle.net/11573/1571893 doi:10.2138/am-2021-7496 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85108235700 info:eu-repo/semantics/closedAccess beryllium and boron: Quintessentially crustal Elba Island lamprophyre dike Lithium Magnesio-lucchesiite new mineral specie O'Grady Batholith San Piero in Campo info:eu-repo/semantics/article 2021 ftunivromairis https://doi.org/10.2138/am-2021-7496 2023-12-06T18:19:03Z Magnesio-lucchesiite, ideally CaMg3Al6(Si6O18)(BO3)3(OH)3O, is a new mineral species of the tourmaline supergroup. The holotype material was discovered within a lamprophyre dike that cross-cuts tourmaline-rich metapelites within the exocontact of the O'Grady Batholith, Northwest Territories (Canada). Two additional samples were found at San Piero in Campo, Elba Island, Tuscany (Italy) in hydrothermal veins embedded in meta- serpentinites within the contact aureole of the Monte Capanne intrusion. The studied crystals of magnesio-lucchesiite are black in a hand sample with vitreous luster, conchoidal fracture, an estimated hardness of 7-8, and a calculated density of 3.168 (Canada) and 3.175 g/cm3 (Italy). In plane-polarized light, magnesio-lucchesiite is pleochroic (O = dark brown, E = colorless) and uniaxial (-); its refractive index values are nω = 1.668(3) and nϵ = 1.644(3) (Canada), and nω = 1.665(5) and nϵ = 1.645(5) (Italy). Magnesio-lucchesiite is trigonal, space group R3m, Z = 3, with a = 15.9910(3) Å, c = 7.2224(2) Å, V = 1599.42(7) Å3 (Canada) and with a = 15.9270(10) Å, c = 7.1270(5) Å, V = 1565.7(2) Å3 (Italy, sample 1). The crystal structure of magnesio-lucchesiite was refined to R1 = 3.06% using 2953 reflections with Fo > 4σ(Fo) (Canadian sample; 1.96% / 1225 for the Italian sample) The Canadian (holotype) sample has the ordered empirical formula X(Ca0.60Na0.39K0.01)ς1.00YMg2.02Fe0.622+Fe0.093+Ti0.25 V0.01Cr0.01ς3.00zAl5.31Fe0.693+ς6.00TSi5.98Al0.02ς6.00O18BO33v(OH)2.59O0.41ς3.00 ${ }^{mathrm{Y}}left(mathrm{Mg}_{2.02} mathrm{Fe}_{0.62}^{2+} mathrm{Fe}_{0.09}^{3+} mathrm{Ti}_{0.25} mathrm{~V}_{0.01} mathrm{Cr}_{0.01} ight)_{Sigma 3.00} mathrm{z}left(mathrm{Al}_{5.31} mathrm{Fe}_{0.69}^{3+} ight)_{Sigma 6.00}left[{ }^{mathrm{T}}left(mathrm{S} mathrm{i}_{5.98} mathrm{Al}_{0.02} ight)_{Sigma 6.00} mathrm{O}_{18} ight]left(mathrm{BO}_{3} ight)_{3}{ }^{mathrm{v}}left[(mathrm{OH})_{2.59} mathrm{O}_{0.41} ight]_{Sigma 3.00}$W(O0.78F0.22)ς1.00. The Italian (co-type) material shows a wider chemical ... Article in Journal/Newspaper Northwest Territories Sapienza Università di Roma: CINECA IRIS American Mineralogist 106 6 862 871 |
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Sapienza Università di Roma: CINECA IRIS |
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language |
English |
topic |
beryllium and boron: Quintessentially crustal Elba Island lamprophyre dike Lithium Magnesio-lucchesiite new mineral specie O'Grady Batholith San Piero in Campo |
spellingShingle |
beryllium and boron: Quintessentially crustal Elba Island lamprophyre dike Lithium Magnesio-lucchesiite new mineral specie O'Grady Batholith San Piero in Campo Scribner E. D. Cempirek J. Groat L. A. James Evans R. Biagioni C. Bosi F. Dini A. Halenius U. Orlandi P. Pasero M. Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup |
topic_facet |
beryllium and boron: Quintessentially crustal Elba Island lamprophyre dike Lithium Magnesio-lucchesiite new mineral specie O'Grady Batholith San Piero in Campo |
description |
Magnesio-lucchesiite, ideally CaMg3Al6(Si6O18)(BO3)3(OH)3O, is a new mineral species of the tourmaline supergroup. The holotype material was discovered within a lamprophyre dike that cross-cuts tourmaline-rich metapelites within the exocontact of the O'Grady Batholith, Northwest Territories (Canada). Two additional samples were found at San Piero in Campo, Elba Island, Tuscany (Italy) in hydrothermal veins embedded in meta- serpentinites within the contact aureole of the Monte Capanne intrusion. The studied crystals of magnesio-lucchesiite are black in a hand sample with vitreous luster, conchoidal fracture, an estimated hardness of 7-8, and a calculated density of 3.168 (Canada) and 3.175 g/cm3 (Italy). In plane-polarized light, magnesio-lucchesiite is pleochroic (O = dark brown, E = colorless) and uniaxial (-); its refractive index values are nω = 1.668(3) and nϵ = 1.644(3) (Canada), and nω = 1.665(5) and nϵ = 1.645(5) (Italy). Magnesio-lucchesiite is trigonal, space group R3m, Z = 3, with a = 15.9910(3) Å, c = 7.2224(2) Å, V = 1599.42(7) Å3 (Canada) and with a = 15.9270(10) Å, c = 7.1270(5) Å, V = 1565.7(2) Å3 (Italy, sample 1). The crystal structure of magnesio-lucchesiite was refined to R1 = 3.06% using 2953 reflections with Fo > 4σ(Fo) (Canadian sample; 1.96% / 1225 for the Italian sample) The Canadian (holotype) sample has the ordered empirical formula X(Ca0.60Na0.39K0.01)ς1.00YMg2.02Fe0.622+Fe0.093+Ti0.25 V0.01Cr0.01ς3.00zAl5.31Fe0.693+ς6.00TSi5.98Al0.02ς6.00O18BO33v(OH)2.59O0.41ς3.00 ${ }^{mathrm{Y}}left(mathrm{Mg}_{2.02} mathrm{Fe}_{0.62}^{2+} mathrm{Fe}_{0.09}^{3+} mathrm{Ti}_{0.25} mathrm{~V}_{0.01} mathrm{Cr}_{0.01} ight)_{Sigma 3.00} mathrm{z}left(mathrm{Al}_{5.31} mathrm{Fe}_{0.69}^{3+} ight)_{Sigma 6.00}left[{ }^{mathrm{T}}left(mathrm{S} mathrm{i}_{5.98} mathrm{Al}_{0.02} ight)_{Sigma 6.00} mathrm{O}_{18} ight]left(mathrm{BO}_{3} ight)_{3}{ }^{mathrm{v}}left[(mathrm{OH})_{2.59} mathrm{O}_{0.41} ight]_{Sigma 3.00}$W(O0.78F0.22)ς1.00. The Italian (co-type) material shows a wider chemical ... |
author2 |
Scribner, E. D. Cempirek, J. Groat, L. A. James Evans, R. Biagioni, C. Bosi, F. Dini, A. Halenius, U. Orlandi, P. Pasero, M. |
format |
Article in Journal/Newspaper |
author |
Scribner E. D. Cempirek J. Groat L. A. James Evans R. Biagioni C. Bosi F. Dini A. Halenius U. Orlandi P. Pasero M. |
author_facet |
Scribner E. D. Cempirek J. Groat L. A. James Evans R. Biagioni C. Bosi F. Dini A. Halenius U. Orlandi P. Pasero M. |
author_sort |
Scribner E. D. |
title |
Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup |
title_short |
Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup |
title_full |
Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup |
title_fullStr |
Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup |
title_full_unstemmed |
Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup |
title_sort |
magnesio-lucchesiite, camg3al6(si6o18)(bo3)3(oh)3o, a new species of the tourmaline supergroup |
publisher |
Mineralogical Society of America |
publishDate |
2021 |
url |
http://hdl.handle.net/11573/1571893 https://doi.org/10.2138/am-2021-7496 |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000673958300002 volume:106 issue:6 firstpage:862 lastpage:871 numberofpages:10 journal:AMERICAN MINERALOGIST http://hdl.handle.net/11573/1571893 doi:10.2138/am-2021-7496 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85108235700 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.2138/am-2021-7496 |
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