Yes, China Yellow Quartzite can be used outdoors. Quartzite is a durable and weather-resistant natural stone that can withstand outdoor elements such as moisture, UV rays, and temperature fluctuations. It is commonly used for outdoor applications such as patio paving, pool decks, walkways, and exterior wall cladding. However, it is important to properly seal the stone and maintain regular cleaning and resealing to ensure its longevity and appearance.