(Of an igneous rock) containing a higher proportion of aluminium than of sodium and potassium (taken together).
More example sentences
- Although biotite is capable of this, other minerals such as muscovite, garnet and cordierite are more efficient and preferentially occur in strongly peraluminous rocks.
- The migmatites are spatially and temporally related to poorly exposed peraluminous intrusions such as the Strichen granite.
- In keeping with their amphibole content, almost all the samples are metaluminous to slightly peraluminous.