Question

The principal chemical constituent present in argillaceous rock is:

1. SiO2
2. Lime
3.  Al2O3
4. Dolomite

Answer 1

Correct Answer - Option 3 :  Al2O3

According to the chemical classification of rocks, they are classified as follows

1) Argillaceous rocks:

The rocks which contain clay or alumina as a main constituent is called argillaceous rocks.

Ex: Slate, Laterite, and Kaolin

2) Siliceous rocks:

The rocks which contain silica as the main constituent is called as siliceous rocks

Ex: Granite, Gneiss, Trap, Basalt, Sandstone, and Quartzite.

3) Calcareous rocks:

The rocks which contain lime or calcium as the main constituent are called calcareous rocks.

Ex: Marble, Limestone, and Dolomite

According to geological classification, rocks are classified as

1) Igneous rocks:

Ex: Granite, Basalt, Trap, and Dolerite

2) Sedimentary rocks:

Ex: Sandstone, Shale, Limestone, and Laterite

3) Metamorphic rocks:

Ex: Marble, Quartzite, Slate, and Schist