What are the structural forms of tiles in China buildings?

There are three kinds of tiles: gray tile, black tile and glazed tile. Gray tiles are relatively loose and used in general buildings. Black tiles are made of clear mud, which are dense in texture and smooth in surface after polishing, and are often used in palaces and temples. The glazed tiles unearthed from Daming Palace in Chang 'an are mostly green, followed by blue, and there are green glazed tiles with lotus flowers carved on the surface, while the palace in Tokyo City (now near Ning 'an, Heilongjiang Province) in Bohai is built on the column foundation with green glazed components. The roofs of important buildings in the Tang Dynasty are often covered with tiles and kisses. Compared with Song, Ming and Qing dynasties, the form of kissing is far more concise and elegant. Tiles often use lotus petal patterns.