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Sökning: WFRF:(Dini Andrea) > (2020-2024) > Magnesio-lucchesiit...
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 05014naa a2200409 4500 | |
| 001 | oai:DiVA.org:nrm-4207 | |
| 003 | SwePub | |
| 008 | 210528s2021 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-42072 URI |
| 024 | 7 | a https://doi.org/10.2138/am-2021-74962 DOI |
| 040 | a (SwePub)nrm | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Scribner, Emily D.u Clemson University, South Caroline, USA4 aut |
| 245 | 1 0 | a Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup |
| 264 | 1 | b Mineralogical Society of America,c 2021 |
| 338 | a print2 rdacarrier | |
| 520 | a 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)Σ1.00Y(Mg2.02Fe2+0.62Fe3+0.09Ti0.25V0.01Cr0.01)Σ3.00Z(Al5.31Fe3+0.69)Σ6.00[T(Si5.98Al0.02)Σ6.00O18(BO3)3V[(OH)2.59O0.41]Σ3.00W(O0.78F0.22)Σ1.00. The Italian (co-type) material shows a wider chemical variability, with two different samples from the same locality having ordered chemical formulas: X(Ca0.88Na0.12)Σ1.00Y(Mg1.45Fe2+0.40Al0.79Fe3+0.36)Σ3.00ZAl6[T(Si5.05Al0.95)Σ6.00O18](BO3)3V[(OH)2.90O0.10]Σ3.00W(O0.98F0.02)Σ1.00(sample 1) and X(Ca0.71Na0.21o0.08)Σ1.00Y(Mg2.49Fe2+0.41Ti0.10)Σ3.00Z(Al5.44Fe3+0.46Mg0.09V0.01)Σ6.00[T(Si5.87Al0.13)Σ6.00O18](BO3)3V(OH)3W[O0.61(OH)0.39]Σ1.00 (sample 2). Magnesio-lucchesiite is an oxy-species belonging to the calcic group of the tourmaline supergroup. It is related to lucchesiite by the homovalent substitution YFe ↔ YMg, and to feruvite by the homovalent and heterovalent substitutions YFe ↔ YMg and ZAl3+ + WO2– ↔ ZMg2+ + W(OH)1–. The new mineral was approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification (IMA 2019-025). Occurrences of magnesio-lucchesiite show that its presence is not restricted to replacement of mafic minerals only; it may also form in metacarbonate rocks by fluctuations of F and Al during crystallization of common uvitic tourmaline. High miscibility with other tourmaline end-members indicates the large petrogenetic potential of magnesio-lucchesiite in Mg,Al-rich calc-silicate rocks, as well as contact-metamorphic and metasomatic rocks. | |
| 650 | 7 | a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geokemi0 (SwePub)105062 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geochemistry0 (SwePub)105062 hsv//eng |
| 653 | a The changing Earth | |
| 653 | a Den föränderliga jorden | |
| 700 | 1 | a Cempírek, Janu Masaryk University, Brno, Czech Republic4 aut |
| 700 | 1 | a Groat, Lee Au University of British Columbia; Vancouver, Canada4 aut |
| 700 | 1 | a Evans, Jamesu University of British Columbia, Vancouver, Canada4 aut |
| 700 | 1 | a Biagioni, Cristianu Università di Pisa, Italy4 aut |
| 700 | 1 | a Bosi, Ferdinandou Sapienza Università di Roma, Rome, Italy4 aut |
| 700 | 1 | a Dini, Andreau Istituto di Geoscienze e Georisorse-CNR, Pisa, Italy4 aut |
| 700 | 1 | a Hålenius, Ulfu Naturhistoriska riksmuseet,Enheten för geovetenskap4 aut0 (Swepub:nrm)ulfhalen |
| 700 | 1 | a Orlandi, Paolou Università di Pisa, Italy4 aut |
| 700 | 1 | a Pasero, Marcou Università di Pisa, Italy4 aut |
| 710 | 2 | a Clemson University, South Caroline, USAb Masaryk University, Brno, Czech Republic4 org |
| 773 | 0 | t American Mineralogistd : Mineralogical Society of Americag 106:6, s. 862-871q 106:6<862-871x 0003-004Xx 1945-3027 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-4207 |
| 856 | 4 8 | u https://doi.org/10.2138/am-2021-7496 |
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