An architectural innovation in early Renaissance Florence was the use and style of a rusticated façade. Rustication is where the edges of the stone are flat surfaces, but the center facing the outside of the building is rough and projecting outward. What type of stone did the Florence architects use to make their rusticated facades and why did they pick that stone?

Pietraforte stone was selected, because it was strong, had a color that would turn light brown over time, and it developed interesting textures for the rough center.

Explanation:

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Rustication is a technique used in masonry. This was popular in the ancient world, but became widely used during the Italian Renaissance. This technique consists of cutting the edges of the stone flat, while leaving the center rough and facing outward.

During the fifteenth century, this technique became popular in Florence. The use of it in private houses established a model for elegant urban residences throughout Europe. These constructions usually used a stone known as "pietra forte." Pietra forte is a strong type of stone that turns brown over time and presents interesting textures for the rough center. It was also widely available in the quarries that surrounded Florence.

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