tholeiitic definition
tholeiitic means a type of basaltic rock that is characterized by the presence of low-calcium pyroxenes in addition to clinopyroxene and calcic plagioclase.
tholeiitic means a type of basalt which is poor in olivene and contains orthopyroxene and / or pigeonite. The groundmass is generally glassy containing silica (quartz) and alkalic feldspar.
tholeiitic means a type of mafic ingneaous rock usually formed along mid-ocean ridges and the main component of oceanic crust;