Introduction to strange stones: Lingbi stone is a metamorphic rock like jade, which is a cryptocrystalline limestone. It is composed of fine-grained calcite with uniform particle size. It is dark or patterned because it contains metallic minerals or organic matter. Lingbi County is the origin of Lingbi Stone. The strange stone was formed more than 800 million years ago and can make a pleasant sound. In recent years, it has gradually become a favorite choice of collectors.