a) Name the primary minerals present in an igneous rock.
a ) Quartz (SiO2), feldspars, amphiboles, pyroxenes and micas are the most common primary minerals in igneous rocks.
b) Name the secondary minerals present in a sedimentary rock.
b) Calcite (CaCO3), dolomite [CaMg(CO3)2 ], quartz and clays are the secondary minerals in sedimentary rocks.