Manhattan Tumbled is quarried from a bedrock quarry in the Sichuan Province of China. During the winter months, this quarry is shut down for a period of time because of the harsh conditions of snow and ice. This is a metamorphic stone which evolved from a limestone due to extreme heat and pressure. As a natural stone product, it is recommended that this be sealed to extend its longevity. When installing white marble, you must use a white thinset. Using grey thinset will leave trowel lines and could stain the marble.