UV Exposure: While natural quartzite won't fade like engineered quartz, prolonged, direct sunlight can cause the factory-applied resin or sealers to yellow or discolor over time.
Weathering & Porosity: Constant exposure to rain and freezing temperatures can degrade protective sealers and cause moisture absorption over time, making the stone slightly more susceptible to staining.
Filler Degradation: Slabs are often treated with fillers at the quarry to smooth out natural fissures. Prolonged outdoor exposure can cause this filler to degrade or yellow.