Why did Italian Gothic buildings use brick and marble more often than stone?

In the context of Italian Gothic architecture, the preference for brick as a primary building material and marble as a decorative element was largely determined by geographic and geologic factors.1

Unlike many other European countries that closely imitated the stone-heavy architectural styles of northern France, Italian builders relied on materials that were more readily available and suited to their regional traditions. This reliance on brick and marble contributed to the distinctiveness of Italian Gothic buildings, which often diverged from northern patterns in both construction and aesthetic detail. While Italian masons were aware of northern Gothic conventions—such as pointed arches and ribbed vaults—they adapted these elements to their own unique style, often prioritizing the manipulation of two-dimensional patterns and the use of marble for decorative effects, as seen in the facades of cathedrals in cities like Orvieto, Siena, and Florence.1