Original paper

Hydrated barium aluminosilicates, BaAl2Si2O2∙n H2O, and their relations to cymrite and hexacelsian

Viswanathan, Krishnamoorthy; Harneit, Otto; Epple, Matthias

European Journal of Mineralogy Volume 4 Number 2 (1992), p. 271 - 278

17 references

published: Apr 21, 1992
manuscript accepted: Dec 5, 1991
manuscript received: Oct 18, 1990

DOI: 10.1127/ejm/4/2/0271

BibTeX file

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Abstract Barium aluminosilicates with chemical compositions BaAl2Si2O8*n H2O (n varying between 0 and 1) crystallize metastably in hydrothermal experiments at temperatures below 600°C and pressures of 1 to 3 kbar. Their powder patterns, their composition, their thermal behaviour and their readiness to crystallize metastably suggest that they have a crystal structure similar to those of a natural cymrite, BaAl2Si2O8*1 H2O and synthetic hexacelsian, BaAl2Si2O8∙ Moreover, the variation of their lattice dimensions with water contents suggests that they form a crystallographically and chemically related series of compounds between the high-temperature phase hexacelsian and the high-pressure mineral cymrite in the system BaAl2Si2O8* H2O


Cymritehexacelsiancelsianhydrated Ba-aluminosilicatehigh-pressure mineral