IMA 2013-001 = raygrantite

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
Marco E. Ciriotti
Messaggi: 23136
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

IMA 2013-001 = raygrantite

Messaggio da Marco E. Ciriotti » mer 22 mar, 2017 13:17

Prossima pubblicazione.

Referenza:
▪ Yang, H., Andrade, M.B., Downs, R.T., Gibbs, R.B., Jenkins, R.A. (2016): Raygrantite, Pb10Zn(SO4)6(SiO4)2(OH)2, a new mineral isostructural with iranite, from Big Horn Mountains, Maricopa County, Arizona, USA. Canadian Mineralogist, 54, (in press).
Marco E. Ciriotti

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

Avatar utente
Marco E. Ciriotti
Messaggi: 23136
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2013-001 = raygrantite

Messaggio da Marco E. Ciriotti » mer 05 apr, 2017 8:17

Pubblicazione effettuata.

Referenza:
▪ Yang, H., Andrade, M.B., Downs, R.T., Gibbs, R.B., Jenkins, R.A. (2016): Raygrantite, Pb10Zn(SO4)6(SiO4)2(OH)2, a new mineral isostructural with iranite, from Big Horn Mountains, Maricopa County, Arizona, USA. Canadian Mineralogist, 54, 625-634.

Abstract:
A new mineral species, raygrantite, ideally Pb10Zn(SO4)6(SiO4)2(OH)2, has been found in the Big Horn Mountains, Maricopa County, Arizona, USA. Associated minerals are galena, anglesite, cerussite, lanarkite, leadhillite, mattheddleite, alamosite, hydrocerussite, caledonite, and diaboleite. Raygrantite crystals are bladed with striations parallel to the elongated direction (the c axis). Twinning (fish-tail type) is pervasive on (1 2 -1). The mineral is colorless, transparent with white streak, and has a vitreous luster. It is brittle and has a Mohs hardness of ∼3; cleavage is good on {120} and no parting was observed. The calculated density is 6.374 g/cm3. Optically, raygrantite is biaxial (+), with nα = 1.915(7), nβ = 1.981(7), nγ = 2.068(9), 2Vmeas = 76(2)°, and 2Vcalc = 85°. It is insoluble in water, acetone, or hydrochloric acid. An electron microprobe analysis yielded the empirical formula Pb2+9.81Zn2+0.93(S1.00O4)6(Si1.05O4)2(OH)2.
Raygrantite is a new member of the iranite mineral group. It is triclinic, with space group P-1 and unit-cell parameters a 9.3175(4), b 11.1973(5), c 10.8318(5) Å, α 120.374(2), β 90.511(2), γ 56.471(2)°, and V 753.13(6) Å3. Its crystal structure, refined to R1 = 0.031, is characterized by slabs that lie parallel to (120) of SO4 and SiO4 tetrahedra with ZnO4(OH)2 octahedra, held together by Pb2+ cations displaying a wide range of Pb–O bond distances. The discovery of raygrantite indicates that, in addition to complete OH–F and Cu–Zn substitutions, there is also a complete substitution between (CrO4)2– and (SO4)2– in the iranite group of minerals, pointing to the possible existence of a number of other (SO4)2–-bearing iranite-type phases yet to be found or synthesized.
Marco E. Ciriotti

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

Rispondi

Chi c’è in linea

Visitano il forum: bortolozzi giorgio e 1 ospite