What were the buildings of Pompeii made out of?

Pompeii was built primarily with two local construction materials: lava and tuff.

1. Lava: Pompeii is situated in an area of volcanic activity, and the ancient city was frequently damaged by volcanic eruptions. The lava from the nearby volcano, Mount Vesuvius, was used as a building material. Lava is a natural material formed when molten rock from a volcanic eruption cools and hardens. It is a hard and durable material that was widely used in Pompeii for the construction of walls and foundations.

2. Tuff: Tuff is another volcanic material that was commonly used in the construction of Pompeii. It is formed from layers of volcanic ash that have been compressed over time. Tuff is a softer material compared to lava, but it is still strong and durable. It was mainly used in Pompeii for the construction of walls and as a lightweight material for roof coverings.