All concrete products and many natural stones, under varying conditions of moisture and temperature, are frequently subject to crazing. A manufacturer careful in proportioning of designs and watchful of compaction techniques and curing methods will minimize the likelihood of crazing as a result of manufacturing causes. (Cast Stone Institute, Inc.)

Crazing is generally undesirable; however, certain glazes, referred to as crackle glazes, are specifically composed to develop a controlled form of crazing. (About.com)

Crazing occurs when the surface of a moulding is stretched beyond its limit, due to localised surface stresses being too high at some time during moulding, finishing, or use. (Performance Plastics Ltd)