What characterizes potch opal?

Potch opal is characterized by the absence of play-of-color, which is the phenomenon that causes opal to display a spectrum of colors when viewed from different angles. Unlike precious opal, which exhibits this vibrant optical effect, potch opal appears as a more uniform and opaque material, lacking the colorful brilliance. This distinction makes potch opal unique in the realm of opals, as it is often used for non-jewelry purposes or carved into decorative objects. The absence of play-of-color is the defining feature that sets potch opal apart from its more dazzling counterparts.