A type of quartz conglomerate that contains variously colored pebbles is frequently referred to as puddingstone. The pebbles in this rock are often jasper, a type of opaque quartz that may be brown, red, or yellow, but may also consist of various other minerals. The assortment of colored pebbles in the ground matrix are generally believed to resemble raisins, nuts, and other fruits in a pudding, hence the name of the rock. Extremely hard, puddingstones can be polished to a nice luster and are often utilized as ornamental rocks, sometimes appearing in cut form as bookends, fountains, necklaces, and similar items.