Dellagiustaite: A novel natural spinel containing V2+

Fernando Cámara, Luca Bindi, Adriana Pagano, Renato Pagano, Sarah E.M. Gain, William L. Griffin

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Dellagiustaite, ideally Al2V2+O4, is a new spinel-group mineral from Sierra de Comechingones, San Luis, Argentina, where it is found associated with hibonite (containing tubular inclusions, 5–100 µm, of metallic vanadium), grossite, and two other unknown phases with ideal stoichiometry of Ca2Al3O6F and Ca2Al2SiO7. A very similar rock containing dellagiustaite has been found at Mt Carmel (northern Israel), where super-reduced mineral assemblages have crystallized from high-T melts trapped in corundum aggregates (micro-xenoliths) within picritic-tholeiitic lavas ejected from Cretaceous volcanoes. In the holotype, euhedral grains of dellagiustaite are found as inclusions in grossite. The empirical average chemical formula of dellagiustaite is (Al1.09 V2+ 0.91 V3+ 0.87 Mg0.08 Ti3+ 0.04 Mn0.01)Σ3O4, but it may show limited replacement of V2+ by Mg and of V3+ by Al. As Al is the dominant trivalent cation, the ideal formula is Al2V2+O4 according to the current IMA rules. Dellagiustaite shows the usual space group of spinel-group minerals (Fd3m, R1 = 1.46%) with a = 8.1950(1) Å. The observed mean bond lengths <T–O> = 1.782(2) Å and <M–O> = 2.0445(9) Å, the observed site scattering (T = 13.3 eps, M = 22.5 eps), and the chemical composition show that dellagiustaite is an inverse spinel: T tetrahedra are occupied by Al3+, whereas M octahedra are occupied by V2+ and V3+, leading to the site assignment asTAlM(V2+ 0.91 V3+ 0.88 Al3+ 0.09 Mg0.08 Ti3+ 0.03 Mn0.01)O4.

LanguageEnglish
Article number4
Number of pages16
JournalMinerals
Volume9
Issue number1
Early online date21 Dec 2018
DOIs
Publication statusPublished - 1 Jan 2019

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spinel
Minerals
mineral
hibonite
Volcanoes
Corundum
corundum
Bond length
vanadium
stoichiometry
Stoichiometry
Vanadium
volcano
replacement
cation
Positive ions
chemical composition
Rocks
scattering
melt

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Cámara, F., Bindi, L., Pagano, A., Pagano, R., Gain, S. E. M., & Griffin, W. L. (2019). Dellagiustaite: A novel natural spinel containing V2+. Minerals, 9(1), [4]. https://doi.org/10.3390/min9010004
Cámara, Fernando ; Bindi, Luca ; Pagano, Adriana ; Pagano, Renato ; Gain, Sarah E.M. ; Griffin, William L. / Dellagiustaite : A novel natural spinel containing V2+. In: Minerals. 2019 ; Vol. 9, No. 1.
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title = "Dellagiustaite: A novel natural spinel containing V2+",
abstract = "Dellagiustaite, ideally Al2V2+O4, is a new spinel-group mineral from Sierra de Comechingones, San Luis, Argentina, where it is found associated with hibonite (containing tubular inclusions, 5–100 µm, of metallic vanadium), grossite, and two other unknown phases with ideal stoichiometry of Ca2Al3O6F and Ca2Al2SiO7. A very similar rock containing dellagiustaite has been found at Mt Carmel (northern Israel), where super-reduced mineral assemblages have crystallized from high-T melts trapped in corundum aggregates (micro-xenoliths) within picritic-tholeiitic lavas ejected from Cretaceous volcanoes. In the holotype, euhedral grains of dellagiustaite are found as inclusions in grossite. The empirical average chemical formula of dellagiustaite is (Al1.09 V2+ 0.91 V3+ 0.87 Mg0.08 Ti3+ 0.04 Mn0.01)Σ3O4, but it may show limited replacement of V2+ by Mg and of V3+ by Al. As Al is the dominant trivalent cation, the ideal formula is Al2V2+O4 according to the current IMA rules. Dellagiustaite shows the usual space group of spinel-group minerals (Fd3m, R1 = 1.46{\%}) with a = 8.1950(1) {\AA}. The observed mean bond lengths <T–O> = 1.782(2) {\AA} and <M–O> = 2.0445(9) {\AA}, the observed site scattering (T = 13.3 eps, M = 22.5 eps), and the chemical composition show that dellagiustaite is an inverse spinel: T tetrahedra are occupied by Al3+, whereas M octahedra are occupied by V2+ and V3+, leading to the site assignment asTAlM(V2+ 0.91 V3+ 0.88 Al3+ 0.09 Mg0.08 Ti3+ 0.03 Mn0.01)O4.",
keywords = "Argentina, Dellagiustaite, Israel, Mt carmel, New crystal structure, Oxyspinel subgroup, Sierra de comechingones, Spinel supergroup",
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Cámara, F, Bindi, L, Pagano, A, Pagano, R, Gain, SEM & Griffin, WL 2019, 'Dellagiustaite: A novel natural spinel containing V2+', Minerals, vol. 9, no. 1, 4. https://doi.org/10.3390/min9010004

Dellagiustaite : A novel natural spinel containing V2+. / Cámara, Fernando; Bindi, Luca; Pagano, Adriana; Pagano, Renato; Gain, Sarah E.M.; Griffin, William L.

In: Minerals, Vol. 9, No. 1, 4, 01.01.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Dellagiustaite

T2 - Minerals

AU - Cámara, Fernando

AU - Bindi, Luca

AU - Pagano, Adriana

AU - Pagano, Renato

AU - Gain, Sarah E.M.

AU - Griffin, William L.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Dellagiustaite, ideally Al2V2+O4, is a new spinel-group mineral from Sierra de Comechingones, San Luis, Argentina, where it is found associated with hibonite (containing tubular inclusions, 5–100 µm, of metallic vanadium), grossite, and two other unknown phases with ideal stoichiometry of Ca2Al3O6F and Ca2Al2SiO7. A very similar rock containing dellagiustaite has been found at Mt Carmel (northern Israel), where super-reduced mineral assemblages have crystallized from high-T melts trapped in corundum aggregates (micro-xenoliths) within picritic-tholeiitic lavas ejected from Cretaceous volcanoes. In the holotype, euhedral grains of dellagiustaite are found as inclusions in grossite. The empirical average chemical formula of dellagiustaite is (Al1.09 V2+ 0.91 V3+ 0.87 Mg0.08 Ti3+ 0.04 Mn0.01)Σ3O4, but it may show limited replacement of V2+ by Mg and of V3+ by Al. As Al is the dominant trivalent cation, the ideal formula is Al2V2+O4 according to the current IMA rules. Dellagiustaite shows the usual space group of spinel-group minerals (Fd3m, R1 = 1.46%) with a = 8.1950(1) Å. The observed mean bond lengths <T–O> = 1.782(2) Å and <M–O> = 2.0445(9) Å, the observed site scattering (T = 13.3 eps, M = 22.5 eps), and the chemical composition show that dellagiustaite is an inverse spinel: T tetrahedra are occupied by Al3+, whereas M octahedra are occupied by V2+ and V3+, leading to the site assignment asTAlM(V2+ 0.91 V3+ 0.88 Al3+ 0.09 Mg0.08 Ti3+ 0.03 Mn0.01)O4.

AB - Dellagiustaite, ideally Al2V2+O4, is a new spinel-group mineral from Sierra de Comechingones, San Luis, Argentina, where it is found associated with hibonite (containing tubular inclusions, 5–100 µm, of metallic vanadium), grossite, and two other unknown phases with ideal stoichiometry of Ca2Al3O6F and Ca2Al2SiO7. A very similar rock containing dellagiustaite has been found at Mt Carmel (northern Israel), where super-reduced mineral assemblages have crystallized from high-T melts trapped in corundum aggregates (micro-xenoliths) within picritic-tholeiitic lavas ejected from Cretaceous volcanoes. In the holotype, euhedral grains of dellagiustaite are found as inclusions in grossite. The empirical average chemical formula of dellagiustaite is (Al1.09 V2+ 0.91 V3+ 0.87 Mg0.08 Ti3+ 0.04 Mn0.01)Σ3O4, but it may show limited replacement of V2+ by Mg and of V3+ by Al. As Al is the dominant trivalent cation, the ideal formula is Al2V2+O4 according to the current IMA rules. Dellagiustaite shows the usual space group of spinel-group minerals (Fd3m, R1 = 1.46%) with a = 8.1950(1) Å. The observed mean bond lengths <T–O> = 1.782(2) Å and <M–O> = 2.0445(9) Å, the observed site scattering (T = 13.3 eps, M = 22.5 eps), and the chemical composition show that dellagiustaite is an inverse spinel: T tetrahedra are occupied by Al3+, whereas M octahedra are occupied by V2+ and V3+, leading to the site assignment asTAlM(V2+ 0.91 V3+ 0.88 Al3+ 0.09 Mg0.08 Ti3+ 0.03 Mn0.01)O4.

KW - Argentina

KW - Dellagiustaite

KW - Israel

KW - Mt carmel

KW - New crystal structure

KW - Oxyspinel subgroup

KW - Sierra de comechingones

KW - Spinel supergroup

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U2 - 10.3390/min9010004

DO - 10.3390/min9010004

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JO - Minerals

JF - Minerals

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Cámara F, Bindi L, Pagano A, Pagano R, Gain SEM, Griffin WL. Dellagiustaite: A novel natural spinel containing V2+. Minerals. 2019 Jan 1;9(1). 4. https://doi.org/10.3390/min9010004