Why is marble prone to developing microcracks during temperature swings?

Marble is prone to developing microcracks during temperature swings due to its unique mineral composition and thermal properties. As a metamorphic rock primarily composed of calcite or dolomite, marble expands and contracts with temperature changes. However, its crystalline structure lacks uniform elasticity, causing stress concentrations that lead to tiny fractures.

Thermal expansion differences between mineral grains exacerbate the issue. When exposed to rapid or extreme temperature fluctuations, some crystals expand faster than others, creating internal tension. Over time, this repeated stress weakens the stone's integrity, resulting in visible or microscopic cracks.

Additionally, moisture trapped within marble can worsen the problem. Water expands when freezing, further stressing the stone's structure. Proper sealing and gradual temperature acclimatization can help minimize microcrack formation in marble surfaces.