New data on the synthesis and stability relations of glaucophane

Details New data on the synthesis and stability relations of glaucophane New data on the synthesis and stability relations of glaucophane

Nov 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20..385m&link_type=abstract

Earth and Planetary Science Letters, Volume 20, Issue 3, p. 385-390.

Computer Science

8

Scientific paper

Preliminary experiments on the bulk composition Na2Mg3Al2Si8O23 + excess H2O do not support the earlier-reported synthesis of end-member glaucophane, Na2Mg3Al2Si8O22(OH)2, and contradict the reported polymorphism of this mineral. Amphiboles grown in this study near the PT synthesis conditions of the so-called high-pressure polymorph glaucophane II are not ``on composition'', but are related to end-member glaucophane by the substitution 2Mg2+ = Na+Al3+; nevertheless, these amphiboles exhibit unit-cell parameters approximating those of iron-free (extrapolated) glaucophane much more closely than glaucophane II. Glaucophane I, the so-called low-pressure polymorph, is probably related to the amphibole magnesiorichterite, Na2Mg6Si8O22(OH)2, in composition. From these data it appears that the most likely stability field for end-member glaucophane must lie, in accordance with natural occurrences of iron-bearing glaucophane, at high pressures and moderate to low temperatures.

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