Unusual weathering products of oldhamite parentage in the Norton County enstatite achondrite

Details Unusual weathering products of oldhamite parentage in the Norton County enstatite achondrite Unusual weathering products of oldhamite parentage in the Norton County enstatite achondrite

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981metic..16..141o&link_type=abstract

Meteoritics, vol. 16, June 30, 1981, p. 141-152.

Computer Science

14

Enstatite, Mineralogy, Norton County Achondrite, Weathering, Calcite, Hydrolysis, Powder (Particles), Surface Properties, X Ray Analysis, Meteorites, Achondrites, Enstatites, Norton County Meteorite, Weathering, X-Ray Analysis, Mineralogy, Calcium, Portlandite, Patterns, Vaterite, Calcite, Bassanite, Oldhamite, Experiments, Procedure, Data, Samples, Meteorite, Electron Microprobe, Photomicrographs

Scientific paper

Oldhamite, CaS, is found only in enstatite chondrites and enstatite achondrites. During the course of a comprehensive study of Norton County, oldhamite was found in several polished thin sections of enstatite achondrite. Inspection of thousands of specimens of Norton County showed that occasionally white, pale-yellow and brown specks, generally a few millimeters in size, occur on their surfaces. X-ray powder analysis of these materials shows that they contain portlandite, Ca(OH)2, vaterite (CaCO3, hexagonal), calcite (CaCO3, trigonal), bassanite (CaSO4 1/2 H2O) and one unknown species. It is suggested that these minerals were produced by terrestrial weathering of oldhamite.

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