When selecting stone for outdoor sculptures, durability is a critical factor. Both marble and granite are popular choices, but their performance in outdoor environments differs significantly.

Granite is renowned for its exceptional durability, making it ideal for outdoor sculptures. This igneous rock is highly resistant to weathering, temperature fluctuations, and moisture absorption. Its dense crystalline structure prevents cracking and erosion, allowing granite sculptures to maintain their integrity for centuries. Famous outdoor granite monuments like Mount Rushmore demonstrate this longevity.

Marble, while beautiful, is more vulnerable outdoors. As a metamorphic rock, marble is softer and more porous than granite. It absorbs water more readily, making it susceptible to staining, discoloration, and erosion from acid rain. Over time, outdoor marble sculptures may develop a weathered patina, which some artists appreciate for its antique appearance. However, this same quality means marble requires more maintenance in outdoor settings.

For long-lasting outdoor sculptures in harsh climates, granite is generally the superior choice. Its resistance to weathering and minimal maintenance needs make it practical for public art installations. Marble works better in protected outdoor areas or when a classical, weathered look is desired. Proper sealing can extend marble's lifespan outdoors, but it will never match granite's natural resilience.

Ultimately, the choice depends on aesthetic preferences, location, and willingness to maintain the sculpture. While both stones can create stunning outdoor art, granite offers greater durability with less upkeep over time.