Research into materials

Marble:
Marble is a non-foliated metamorphic rock that forms through the metamorphism of limestone. Very durable hard stone. The lifespan of marble is exceptional, thanks to its durability. Marble is one of the oldest building materials, used by the ancient Greeks and Romans. Used in floors, sculptures and other architecture.
Concrete:
Concrete is a mixture of aggregates (sand, gravel, and crushed stone), other additives, cement and water. It is a stable durable material with high compressive strength, withstanding inward pressures but low in tensile strength (stretching forces). Reinforced steel (rebar) is added to the concrete to give slabs tensile load (keeping it tense). Concrete can be used for slabs walls and roofs.
It is a highly durable material and will not rust, rot or burn. Typical life expectancy of concrete is approximately 100 years. Limestone, used for cement, is one of the most abundant minerals on earth.
Glass:
Glass is made from a mixture of sand and silicates, and fired in a kiln. Glass is a very sustainable material, made from abundant raw materials and can be recycled over and over. Glass can last indefinitely.