| http://www.w3.org/ns/prov#value | - Some nodule data is of erratic composition, a factor likely to be due to small sample size, nevertheless there is a common trend in all xenolithic nodules and in Alpine peridotites with a linear shifts in composition seen between pure olivine at the magnesian end, towards a high alumina (>22%) low MgO end member. (see variation diagrams for Hawaii, Canary Is, etc).
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