IMA 2016-018 = fluoro-tremolite

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Marco E. Ciriotti
Messaggi: 24492
Iscritto il: ven 25 giu, 2004 11:31
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IMA 2016-018 = fluoro-tremolite

Messaggio da Marco E. Ciriotti » lun 19 giu, 2017 13:17

Referenza:
▪ Oberti, R., Cámara, F., Bellatrecia, F., Radica, F., Gianfagna, A., Boiocchi, M. (2018): Fluoro-tremolite from the Limecrest-Southdown quarry, Sparta, NJ, USA: crystal chemistry of a newly approved end-members of the amphibole supergroup. MIneralogical Magazine, 82, (in press).

Abstract:
During systematic characterization of amphiboles that still lack a complete mineral description, fluoro-tremolite was identified in a specimen from the Limecrest-Southdown quarry, Sparta, New Jersey, USA, which was kindly provided by the Franklin Mineral Museum. The ideal formula of fluoro-tremolite is A□ BCa2 CMg5 TSi8 O22 WF2 and the empirical formula derived for the holotype specimen, based on the results of electron-microprobe analysis and single-crystal structure refinement, is A(Na0.28K0.02)Σ=0.30 B(Ca1.99Na0.01)Σ=2.00 C(Mg4.70Fe2+ 0.28Zn0.01Ti4+ 0.01)Σ=5.00 T(Si7.68Al0.32)Σ=8.00 O22 W(F1.16OH0.84)Σ=2.00. The unit-cell dimensions are a = 9.846(2), b = 18.050(3), c = 5.2769(14) Å, β = 104.80(2)°, V = 906.7 (3) Å3. The space group is C2/m, Z = 2; the a:b:c ratio is 0.545:1:0.292. Fluoro-tremolite is biaxial (+), with α = 1.5987(5), β = 1.6102(5), γ = 1.6257(5), and 2V (meas.) = 85(1)o, 2V (calc.) = 82o. The strongest ten reflections in the X-ray powder pattern [d values (in Å), I, (hkl)] are: 2.706, 100, (151); 3.126, 67, (310); 2.531, 59, (-202); 3.381, 57,(131); 2.940, 43, (-151, 221); 3.276, 37, (240); 2.337, 36, (-3 5 1); 2.592, 35, (061); 2.731, 34, (-331); 2.163, 34, (261). Both the mineral and the mineral name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA 2016-018); the holotype has been deposited at the Franklin Mineral Museum (32 Evans Street, Franklin, 07416 New Jersey, US), under the catalogue number 7710. Comparison with new data on tremolite and synthetic fluoro-tremolite provides a more sound crystal-chemical model of the end-member compositions and their solid-solution.
Marco E. Ciriotti

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TOSATO FABIO
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Re: IMA 2016-018 = fluoro-tremolite

Messaggio da TOSATO FABIO » lun 19 giu, 2017 15:02

Complimenti a tutti gli autori.
Tosato Fabio
"Il vero viaggio di scoperta non consiste nel cercare nuove terre, ma nell'avere nuovi occhi." M. Proust
Noi siamo anche quello che non siamo riusciti ad essere.
Sic transit gloria mundi.

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Marco E. Ciriotti
Messaggi: 24492
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 2016-018 = fluoro-tremolite

Messaggio da Marco E. Ciriotti » mer 18 apr, 2018 9:55

Pubblicazione effettuata.

Referenza:
▪ Oberti, R., Cámara, F., Bellatrecia, F., Radica, F., Gianfagna, A., Boiocchi, M. (2018): Fluoro-tremolite from the Limecrest-Southdown quarry, Sparta, NJ, USA: crystal chemistry of a newly approved end-members of the amphibole supergroup. MIneralogical Magazine, 82, 145-157.
Marco E. Ciriotti

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