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Synthesis and stability relations of Li (sub 2) Mg (sub 2) [Si (sub 4) O (sub 11) ]

Eva Vitek and Walter V. Maresch
Synthesis and stability relations of Li (sub 2) Mg (sub 2) [Si (sub 4) O (sub 11) ]
European Journal of Mineralogy (December 1993) 5 (6): 1121-1131


This phase represents a new type of silicate structure: a 'loop- branched dreier single-chain silicate' in the classification of Liebau. In the system Li (sub 2) O-MgO-SiO (sub 2) -(H (sub 2) O), its composition is narrowly defined, with no evidence of solid solution; a maximum substitution of 15 mol.% of Mg by Fe (super 2+) has been achieved. The phase has a cusp-shaped stability field bounded at lower T by reaction to amphibole + Li (sub 2) Si (sub 2) O (sub 5) + Li (sub 2) SiO (sub 3) (reaction boundary passes through approx 750 degrees C/0.5 kbar and 795 degrees C/1 kbar). A curve of incongruent melting passing through 920 degrees C/1 bar, 875 degrees C/0.5 kbar and 855 degrees C/1 kbar limits the stability field at higher T (detailed phase relations near the projected intersections of the two terminal reactions at approx 1.8 kbar have yet to be determined). This study indicates that the phase Li (sub 2) Mg (sub 2) [Si (sub 4) O (sub 11) ] must possess a liquidus field at 1 bar and that a redetermination of the classical Li (sub 2) O-MgO-SiO (sub 2) liquidus phase diagram is necessary.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 5
Serial Issue: 6
Title: Synthesis and stability relations of Li (sub 2) Mg (sub 2) [Si (sub 4) O (sub 11) ]
Affiliation: Ruhr-Universitat Bochum, Institut fuer Mineralogie, Bochum, Federal Republic of Germany
Pages: 1121-1131
Published: 199312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 15
Accession Number: 1994-001547
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199401
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