Final answer:
The property described in the statement is the composition of igneous rocks. Igneous rocks can be classified based on their mineral composition, and the major minerals present in the rocks influence their color and overall composition.
Step-by-step explanation:
Light-colored rocks with granitic compositions: These are typically granites or granitic rocks, and they contain minerals like quartz, feldspar, and mica. Granitic compositions are associated with continental crust.
Dark-colored rocks with basaltic compositions: These are typically basalts or basaltic rocks, and they contain minerals like pyroxene and plagioclase feldspar. Basaltic compositions are associated with oceanic crust.
Dark-colored rocks with olivine and pyroxene in ultramafic compositions: These are ultramafic rocks, and they are rich in minerals like olivine and pyroxene. Ultramafic compositions are often associated with mantle rocks.
The classification based on composition helps geologists understand the mineral content and formation conditions of igneous rocks.