Which of the following is the dominant feldspar in basalt?
A)plagioclase
B)microcline
C)orthoclase
D)pyroxene

Question

Quizplus · Accepted Answer

Plagioclase feldspar is the dominant feldspar in basalt. Basalt is a mafic igneous rock, which means it contains high amounts of magnesium and iron and has lower silica content. Plagioclase is a common mineral in mafic rocks and is often the dominant feldspar. Microcline and orthoclase feldspars are more common in granitic rocks and pyroxene is a common mineral in mafic rocks, but it is not a feldspar mineral.

Which of the Following Is the Dominant Feldspar in Basalt