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Stable-isotope and trace-element analyses of calcites from Rossie-type and related gash vein deposits (Brown, 1983; Dix and Robinson, submitted) are quite similar overall and show no apparent correlation with sample color, host rock lithology or geographic distribution.
It also occurs in small voids in calcite I which appear to be miniature gash veins formed by tectonic shearing, where it is associated with chamosite-II, which may either pre-date or postdate it.