Final answer:
The primary material used in the construction of Chartres Cathedral is limestone.
Step-by-step explanation:
The primary material used in the construction of Chartres Cathedral in France is limestone.
Chartres Cathedral is a notable example of Gothic architecture, which emerged during the medieval period. Unlike Romanesque architecture that used various stone materials, such as brick, limestone, granite, and flint, Gothic architecture favored the use of limestone for its construction.
Limestone has several advantages for architectural purposes, including its durability, ability to be easily carved, and ability to retain intricate details. It was commonly used for constructing the walls, columns, and sculptures of Gothic cathedrals.