How are igneous rocks classified

maybe centuries classified according to their chemical and mineral composition as felsic, intermediate, mafic, and ultramafic, and by texture or grain size

Igneous rocks -

These type of rocks are formed via the crystallization of the liquid, which is the molten rocks.

The categories of distribution of the igneous rock is -

1. Intrusive or the plutonic rocks.

2. Extrusive or volcanic rocks.

And the classification of Igneous rock is as follows -

1. felsic

2. mafic