IMA 2019-133 = nioboheftetjernite

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Marco E. Ciriotti
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IMA 2019-133 = nioboheftetjernite

Messaggio da Marco E. Ciriotti » ven 09 ott, 2020 15:26

Prossima pubblicazione.

Referenza:
▪ Likova, I., Rowe, R., Poirier, G., McDonald, A.M., Giester, G. (2021): Nioboheftetjernite, ScNbO4, a new mineral from the Befanamo Pegmatite, Madagascar. Canadian Mineralogist, 59, (in press).
Marco E. Ciriotti

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Marco E. Ciriotti
Messaggi: 28032
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2019-133 = nioboheftetjernite

Messaggio da Marco E. Ciriotti » ven 26 mar, 2021 9:52

Referenza:
▪ Likova, I., Rowe, R., Poirier, G., McDonald, A.M., Giester, G. (2021): Nioboheftetjernite, ScNbO4, a new mineral from the Befanamo Pegmatite, Madagascar. Canadian Mineralogist, 59, (in press).

Abstract:
A new mineral, nioboheftetjernite, ideally ScNbO4, was found in the Befanamo pegmatite, Analamanga, Madagascar. It occurs as anhedral grains and very crude elongated crystals up to 200 μm in length in an intergrowth with rossovskyite, ilmenite, rutile, thortveitite, euxenite-(Y), feldspar, and quartz. The mineral is black with dark-brown to black streak and submetallic luster. It has no cleavage and its fracture is uneven. Dcalc is 5.855 g/cm3. The Raman spectrum and reflectance data are reported. The chemical composition (wt.%) is MgO 0.06, MnO 2.49, Fe2O3 12.14, Sc2O3 11.34, TiO2 5.94, SnO2 1.45, Nb2O5 32.23, Ta2O5 29.93, WO3 3.38, total 98.96. The empirical formula calculated on the basis of 4 O apfu is (Sc0.40Fe3+0.37Ti0.15Mn2+0.08)Σ1.00(Nb0.58Ta0.33W0.03Ti0.03Sn0.02)Σ0.99O4. The simplified general formula is (Sc,Fe3+)(Nb,Ta)O4. Nioboheftetjernite is monoclinic, P2/c, a = 4.7092(3), b = 5.6531(4), c = 5.0530(4) Å, β = 90.453(3)°, and V = 134.515(17) Å3. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 4.722(22)(100), 3.776(22)(011), 3.628(44)(110), forumla⁠, 2.938(83)(111), 2.472(30)(021), and 2961(100)(-111)⁠. The crystal structure, refined from single-crystal X-ray diffraction data (R1 = 0.016), is of the “wolframite” type. The mineral is named as the Nb-analogue of heftetjernite, ScTaO4.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 28032
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2019-133 = nioboheftetjernite

Messaggio da Marco E. Ciriotti » dom 18 apr, 2021 13:53

Pubblicazione effettuata.

Referenza:
▪ Likova, I., Rowe, R., Poirier, G., McDonald, A.M., Giester, G. (2021): Nioboheftetjernite, ScNbO4, a new mineral from the Befanamo Pegmatite, Madagascar. Canadian Mineralogist, 59, 1-8.
Marco E. Ciriotti

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