Which features is used to classify a rock based on its composition

The origin of the rock

The texture of the rock

The type of mineral in the rock

The shapes of the crystal in the rock

The correct answer is "The type of mineral in the rock".

Explanation:

Rocks are classified mostly by its texture and its composition. When a rock is classified based on its composition the feature that is most used is the type of mineral in the rock. For instance, igneous rocks are made of silicate minerals, while quartz, K-feldspar, and muscovite are found in sedimentary rocks.