Explanation:

Quartzite is a metamorphic rock, which means it has undergone a process of transformation from its original state due to intense heat and pressure. It is formed from the sedimentary rock sandstone, which is composed of sand-sized grains of quartz mineral. Over time, the sandstone is buried deep within the earth's crust and subjected to heat and pressure, causing the grains to recrystallize and fuse together to form quartzite.

Characteristics of Quartzite:

- Quartzite is a hard and durable rock, with a Mohs hardness of 7, making it resistant to abrasion and weathering.
- It has a grainy, sugary texture, and is usually white or grey in color, although it can also be found in shades of pink, red, and yellow.
- Quartzite is non-porous and does not absorb water, making it an ideal material for use in construction and landscaping.

Uses of Quartzite:

- Due to its hardness and durability, quartzite is commonly used as a building material for floors, walls, and countertops.
- It is also used in landscaping as decorative rock, as it is resistant to weathering and erosion.
- Quartzite can be crushed and used as a base material for roads and driveways, as it provides good drainage and stability.

Conclusion:

In summary, quartzite is a metamorphic rock formed from the recrystallization of sandstone under intense heat and pressure. It is a hard and durable rock that is commonly used in construction and landscaping due to its resistance to weathering and abrasion.