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@article{1792458,
author = {Scribner, Emily D. and Cempírek, Jan and Groat, Lee A. and Evans, R. James and Biagioni, Cristian and Bosi, Ferdinando and Dini, Andrea and Hålenius, Ulf and Orlandi, Paolo and Pasero, Marco},
article_number = {6},
doi = {http://dx.doi.org/10.2138/am-2021-7496},
keywords = {Magnesio-lucchesiite; new mineral species; lamprophyre dike; O'Grady Batholith; San Piero in Campo; Elba Island; Lithium; beryllium and boron: Quintessentially crustal},
language = {eng},
issn = {0003-004X},
journal = {American Mineralogist},
title = {Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup},
url = {https://doi.org/10.2138/am-2021-7496},
volume = {106},
year = {2021}
}
TY - JOUR
ID - 1792458
AU - Scribner, Emily D. - Cempírek, Jan - Groat, Lee A. - Evans, R. James - Biagioni, Cristian - Bosi, Ferdinando - Dini, Andrea - Hålenius, Ulf - Orlandi, Paolo - Pasero, Marco
PY - 2021
TI - Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup
JF - American Mineralogist
VL - 106
IS - 6
SP - 862-871
EP - 862-871
PB - Mineralogical Society of America
SN - 0003004X
KW - Magnesio-lucchesiite
KW - new mineral species
KW - lamprophyre dike
KW - O'Grady Batholith
KW - San Piero in Campo
KW - Elba Island
KW - Lithium
KW - beryllium and boron: Quintessentially crustal
UR - https://doi.org/10.2138/am-2021-7496
N2 - 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(Ca0.71Na0.21☐0.08)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.
ER -
SCRIBNER, Emily D., Jan CEMPÍREK, Lee A. GROAT, R. James EVANS, Cristian BIAGIONI, Ferdinando BOSI, Andrea DINI, Ulf HÅLENIUS, Paolo ORLANDI a Marco PASERO. Magnesio-lucchesiite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, a new species of the tourmaline supergroup. \textit{American Mineralogist}. Mineralogical Society of America, 2021, roč.~106, č.~6, s.~862-871. ISSN~0003-004X. Dostupné z: https://dx.doi.org/10.2138/am-2021-7496.
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