What is the close relationship between crystal and geomantic omen?

Crystal belongs to a white mercury in the nine planets, which can flourish Wenchang, urge money and purify the environment. Crystal towers, in particular, are widely used in geomantic omen. Crystal ball is something that the west likes to use. People abroad think that magic is combined with us, so it is more common in daily life. In feng shui, white is a lucky star, so crystals are often used to urge luck.