Which feature is used to classify a rock based on its composition?

the origin of the rock
the texture of the rock
the types of minerals in the rock
the shapes of the crystals in the rock

1 answer

The feature used to classify a rock based on its composition is the types of minerals in the rock. This classification focuses on the mineral content and their proportions within the rock, which are key factors in determining the rock's classification, whether it's igneous, sedimentary, or metamorphic.