Electron diffraction analysis of amorphous geological materials
2007; Wiley; Volume: 63; Issue: a1 Linguagem: Inglês
10.1107/s0108767307093749
ISSN1600-5724
AutoresViktória Kovács Kis, Mihály Pósfai, János L. Lábár, István Dódony,
Tópico(s)Building materials and conservation
ResumoThere are minor differences between the chemical compositions of baratovite and berezanskite and their blocks in the crystal structure of faizievite.Baratovite, KLi 3 Ca 7 Ti 2 (Si 6 O 18 ) 2 (OH) 2 , and the baratovite block in faizievite, K 2 (Ca 6 Na)Li 6 Ti 4 (Si 6 O 18 ) 2 F 2 , are related by the substitution: VI Ca 2+ + (OH) - 2 ↔ VI Na + + F - 2 .Berezanskite, K IX L 3 Ti 2 (Si 12 O 30 ), and the berezanskite block in faizievite, KNaLi 3 Ti 2 (Si 12 O 30 , are related by the substitution: IX ↔ IX Na + .Therefore assembley of faizievite from baratovite and berezanskite components is accompanied by the following substitution: VI Ca 2+ + IX + (OH) - 2 ↔ VI Na + + IX Na + + F - 2 .
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