Explanation:

- Option 1: Gypsum

- Gypsum is a soft mineral made of calcium sulfate.

- It's not usually found in beach sands.

- Commonly found in sedimentary rock formations.

- Option 2: Ilmenite

- Ilmenite is a dense mineral rich in iron and titanium.

- Commonly found in beach sands worldwide.

- Used in manufacturing titanium metal and pigments.

- Correct Answer

- Option 3: Gold

- Gold can be found in beach sand, although not common.

- Limited to certain areas, often associated with placer mining.

- Option 4: Kyanite

- Kyanite is a silicate mineral often found in metamorphic rocks.

- Rarely found in beach sands.