Around 1986 John Kerridge asked me to contribute to a new meteorite book. I was supposed to summarise the data on moderately volatile elements, together with Mike Lipschutz, and Jack Larimer who joined us later. I defined moderately volatile elements as those with condensation temperatures between Mg silicates and troilite (FeS). Highly volatile elements have condensation temperatures below FeS. Interestingly the abundances of the latter elements are variable in the different petrologic types of ordinary chondrites. In most cases they are increasingly depleted from type 3 to type 6, whereas moderately volatile element abundances do not vary between the petrologic...
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