Studies by electrical conductivity methods at elevated pressures and temperatures of ultramarine and related minerals

Details Studies by electrical conductivity methods at elevated pressures and temperatures of ultramarine and related minerals Studies by electrical conductivity methods at elevated pressures and temperatures of ultramarine and related minerals

Apr 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..471b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 36, Issue 4, pp.471-480

Physics

Scientific paper

Synthetic ultramarines, (Na( 6-x )Al( 6-x )Si( 6+x )O 24 ·Na 2 S 4 ), sodalite (Na 6 Al 6 Si 6 O 24 · 2NaCl), and nosean (Na 6 Al 6 Si 6 O 24 ·Na 2 SO 4 ), have been studied at up to 60 kbar, 500°C, in a modified Bridgman anvil press. The electrical conductivities, measured by both a.c. and d.c. methods, appear to be due to ion rather than electron migration, and show wide variation from sample to sample probably owing to intercrystalline effects. Near 500°C under pressure these materials undergo chemical reaction forming the denser silicates, nepheline (NaAlSiO 4 ) from sodalite and nosean, and nepheline or Jadeite (NaAlSi 2 O 6 ) from ultramarine.

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