The sizes of mineral grains in an igneous rock are known as

mineral content

bowen’s reaction series

texture

silica content

C. texture

Explanation:

1. Magma after cooling forms an igneous rock.

2. These rocks are crystalline or glassy in texture.

3. These rocks are classified based on their texture. The size of the grain is an important factor which determines the texture of the rock.

4. Phaneritic textured igneous rocks have larger size of crystals and have coarsely grained texture.

5. Aphanitic textured igneous rocks have small-sized crystals and have finely grained texture.

6. Holohyaline textured igneous rocks have glassy texture. Their crystals are very less and tiny.