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# Which of the compounds is composed of Al, Si, O and H?

### Question

Which of the compounds is composed of Al, Si, O and H?

A) Epson salt

B) Limestone

C) Clay

D) Urea

### Explanation:

Between the five main minerals found in clay, kaolinite is the most common. Kaolinite holds the chemical composition Al$$_{2}$$ Si$$_{2}$$O$$_{5}$$(OH)$$_{4}$$ and is an aluminum silicate material with a low “shrink-swell” capacity. It is a soft, white mineral but is often colored orange or red by iron oxide found in the soil.

## Dicussion (1)

• Between the five main minerals found in clay, kaolinite is the most common. Kaolinite holds the chemical composition Al$$_{2}$$ Si$$_{2}$$O$$_{5}$$(OH)$$_{4}$$ and is an aluminum silicate material with a low “shrink-swell” capacity. It is a soft, white mineral but is often colored orange or red by iron oxide found in the soil.