different between peraluminous vs peralkaline

English

per- +? aluminous

peraluminous (comparative more peraluminous, superlative most peraluminous)

(geology) Describing igneous rocks that have a higher molar proportion of aluminium to sodium, potassium and calcium

per- +? alkaline

peralkaline (comparative more peralkaline, superlative most peralkaline)

(geology) Describing igneous rocks that have a higher ratio of sodium and potassium to aluminium than is needed to produce feldspar

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