Biotite is a dark mica mineral that is commonly found in mafic and intermediate igneous rocks.

Rhyolite is a felsic extrusive igneous rock that is rich in silica and has a low percentage of dark minerals, including biotite.

Basalt is a mafic extrusive igneous rock that is relatively low in silica and high in iron and magnesium. It typically has a higher percentage of dark minerals, including biotite.

Therefore, basalt generally has a higher percentage of biotite than rhyolite.