Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Crystal chemistry of strontian soda melilite from nephelinite lava of Mt. Etinde, Cameroon
Autore:
Bindi, L; Bonazzi, P; Fitton, JG;
Indirizzi:
Univ Florence, Dipartimento Sci Terra, I-50121 Florence, Italy Univ Florence Florence Italy I-50121 Sci Terra, I-50121 Florence, Italy Univ Edinburgh, Dept Geol & Geophys, Edinburgh EH9 3JW, Midlothian, Scotland Univ Edinburgh Edinburgh Midlothian Scotland EH9 3JW Midlothian, Scotland
Titolo Testata:
EUROPEAN JOURNAL OF MINERALOGY
fascicolo: 1, volume: 13, anno: 2001,
pagine: 121 - 125
SICI:
0935-1221(200101/02)13:1<121:CCOSSM>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
INCOMMENSURATE PHASE-TRANSITION; STRUCTURAL-PROPERTIES; AKERMANITE; DISTORTION;
Keywords:
strontian soda melilite; crystal chemistry; single-crystal X-ray diffraction; Etinde; Cameroon;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Bindi, L Univ Florence, Dipartimento Sci Terra, Via Pira 4, I-50121 Florence, Italy Univ Florence Via Pira 4 Florence Italy I-50121 Florence, Italy
Citazione:
L. Bindi et al., "Crystal chemistry of strontian soda melilite from nephelinite lava of Mt. Etinde, Cameroon", EUR J MINER, 13(1), 2001, pp. 121-125

Abstract

The crystal structure and chemical composition of two crystals (labelled ET1 and ET2) of strontian soda melilite from Mt. Etinde, Cameroon , are investigated. Quantitative analysis leads to the following formulae: (Ca0.84Sr0.45Na0.71)(Mg0.19Fe0.062+Mn0.03Zn0.02Al0.46Fe0.233+Ti0.01)(Si1.99Al0.01)O-7.00 and (Ca0.83Sr0.45Ni0.72) (Mg0.20Fe0.062+Mn0.03Zn0.01Al0.45Fe0.243+Ti0.02)(Si1.99Al0.01)O-7.00 for ET1 and ET2 respectively. Lattice parameters are: a = 7.754(1), c = 5.101(1) A for ET1 and a = 7.764(1), c = 5.095(1) Angstrom for ET2. The structure is refined up to R-all = 2.64 and 2.78%, respectively, using 430 independent reflections. Substitution of Sr for Ca causes sufficient modification of the tetrahedral laver to destabilize the incommensurate modulated structure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 04:26:12