Verified answer

False, Ultramafic rock rocks are composed of of mafic(dark) minerals such as pyroxene and olivine. while feldspars is a felsic mineral and therefore cannot be largely found in ultramafic rocks

False.

Howver, Sodium-rich feldspars such as albite may occur in ultramafic rocks because they crystalize earlier than the more calcium-rich feldspars such as orthoclase.

See Bowen's Reaction Series

False,because from petrology lectures,i have learned that ultrabasic rocks are largely composed of mafic minerals rich in Iron and magnesium such as inosilicate(pyroxene) and olivine.