Oxy-foitite, □(Fe2þAl2)Al6(Si6O18)(BO3)3(OH)3O, is a new mineral of the tourmaline supergroup. It occurs in high-grade migmatitic gneisses of pelitic composition at the Cooma metamorphic Complex (New South Wales, Australia), in association with muscovite, K-feldspar and quartz. Crystals are black with a vitreous luster, sub-conchoidal fracture and gray streak. Oxy-foitite has a Mohs hardness of ∼7, and has a calculated density of 3.143 g/cm3. In plane-polarized light, oxy-foitite is pleochroic (O = dark brown and E = pale brown), uniaxial negative. Oxy-foitite belongs to the trigonal crystal system, space group R3m, a = 15.9387(3) Å, c = 7.1507(1) Å and V = 1573.20(6) Å3, Z = 3. The crystal structure of oxy-foitite was refined to R1 = 1.48% using 3247 unique reflections from single-crystal X-ray diffraction using MoKa radiation. Crystal-chemical analysis resulted in the empirical structural formula: X(□0.53Na0.45Ca0.01K0.01)S1.00 Y(Al1.53Fe2þ1.16Mg0.22Mn2þ0.05Zn0.01Ti4þ0.03)S3.00 Z (Al5.47Fe3þ0.14Mg0.39)S6.00 [(Si5.89Al0.11)S6.00O18] (BO3)3V(OH)3W[O0.57F0.04(OH)0.39]S1.00. Oxy-foitite belongs to the X-site vacant group of the tourmaline-supergroup minerals, and shows chemical relationships with foitite through the substitution YAl3þ þ WO2!YFe2þ þ W(OH)1–.

Oxy-foitite, (Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup / Bosi, Ferdinando; Skogby, H; Hålenius, U.. - In: EUROPEAN JOURNAL OF MINERALOGY. - ISSN 0935-1221. - STAMPA. - 29:5(2017), pp. 889-896. [10.1127/ejm/2017/0029-2631]

Oxy-foitite, (Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup

BOSI, Ferdinando
;
2017

Abstract

Oxy-foitite, □(Fe2þAl2)Al6(Si6O18)(BO3)3(OH)3O, is a new mineral of the tourmaline supergroup. It occurs in high-grade migmatitic gneisses of pelitic composition at the Cooma metamorphic Complex (New South Wales, Australia), in association with muscovite, K-feldspar and quartz. Crystals are black with a vitreous luster, sub-conchoidal fracture and gray streak. Oxy-foitite has a Mohs hardness of ∼7, and has a calculated density of 3.143 g/cm3. In plane-polarized light, oxy-foitite is pleochroic (O = dark brown and E = pale brown), uniaxial negative. Oxy-foitite belongs to the trigonal crystal system, space group R3m, a = 15.9387(3) Å, c = 7.1507(1) Å and V = 1573.20(6) Å3, Z = 3. The crystal structure of oxy-foitite was refined to R1 = 1.48% using 3247 unique reflections from single-crystal X-ray diffraction using MoKa radiation. Crystal-chemical analysis resulted in the empirical structural formula: X(□0.53Na0.45Ca0.01K0.01)S1.00 Y(Al1.53Fe2þ1.16Mg0.22Mn2þ0.05Zn0.01Ti4þ0.03)S3.00 Z (Al5.47Fe3þ0.14Mg0.39)S6.00 [(Si5.89Al0.11)S6.00O18] (BO3)3V(OH)3W[O0.57F0.04(OH)0.39]S1.00. Oxy-foitite belongs to the X-site vacant group of the tourmaline-supergroup minerals, and shows chemical relationships with foitite through the substitution YAl3þ þ WO2!YFe2þ þ W(OH)1–.
2017
oxy-foitite; tourmaline; crystal structure; optical absorption spectroscopy; infrared spectroscopy; new mineral
01 Pubblicazione su rivista::01a Articolo in rivista
Oxy-foitite, (Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup / Bosi, Ferdinando; Skogby, H; Hålenius, U.. - In: EUROPEAN JOURNAL OF MINERALOGY. - ISSN 0935-1221. - STAMPA. - 29:5(2017), pp. 889-896. [10.1127/ejm/2017/0029-2631]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/953589
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