Peraluminous

Peraluminous

Peraluminous rocks are igneous rocks that have a molecular proportion of aluminium oxide greater than that of sodium oxide, potassium oxide and calcium oxide combined. Compare with peralkaline, metaluminous, and subaluminous.


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  • peraluminous — adjective Describing igneous rocks that have a higher molar proportion of aluminium to sodium, potassium and calcium …   Wiktionary

  • peraluminous — per·aluminous …   English syllables

  • peraluminous — |pər., |per+ adjective Etymology: per + aluminous : having a molecular proportion of alumina greater than that of soda and potash combined used of an igneous rock …   Useful english dictionary

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  • Syenogranite — is a fine to coarse grained intrusive igneous rock of the same general composition as granite. They are characteristically felsic. The feldspar component of syenogranite is predominantly alkaline in character (usually orthoclase). For example,… …   Wikipedia

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