How does granite’s mineral composition affect its color stability in outdoor settings?

Granite is a popular choice for outdoor applications due to its durability and aesthetic appeal. However, its color stability in outdoor settings is heavily influenced by its mineral composition. Granite primarily consists of quartz, feldspar, and mica, each contributing differently to its resistance to weathering.

Quartz, being highly resistant to chemical and physical weathering, helps maintain granite's structural integrity and color over time. Feldspar, though durable, is more prone to chemical breakdown, especially in acidic environments, which can lead to discoloration. Dark-colored minerals like biotite mica may oxidize, causing rust-like stains.

Environmental factors such as UV exposure, rain, and pollution accelerate these processes, but granite with a higher quartz content generally exhibits better color stability. Understanding these mineral interactions helps in selecting the right granite for long-lasting outdoor use.