Usually refers to the phenomenon where the surface or interior of a quartz crystal contains a layer of chalcedony. It is a microcrystalline quartz, a variant of quartz, characterized by a waxy luster and a semi transparent appearance. Highly popular in gemology and mineralogy due to its unique appearance and aesthetic appeal. It usually has a sharp hexagonal columnar shape, while the jadeite layer may appear in different colors such as blue, green, red, or yellow, which are usually determined by trace impurity elements. Not only does it have scientific research value, but it is also favored among collectors and jewelry designers due to its unique aesthetic features. Can be cut and polished, used as decorations or artworks