Abstract
Osumilitc from the type locality, Sakkabiru. Japan, has l>een analyzed by electron microprobe and major differences are observed contrasted with the original wet-chemical analysis. The other two known wcrld occurrences, Sardinia and Oregon, were analyzed. Comparison of all three shows a variation in the number of Na ions per formula accompanied by variations in the percentage of vacancies in the alkali position Becausc of the analytical totals no constituent water can be inferred in these osumilites.
One occurrence (Oregon) exhibits a paragenesis v hich offers the tirst field evidence of the type of breakdown of (metastable) osumilite observed in laboratory experiments.
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