WHAT IS LIGHT OPAL
Light opal makes up the majority of opal mined; it is pale in color and can have a nearly opaque to translucent body but should not be confused with crystal opal which is extremely translucent to transparent. The body color of light opal can vary tremendously and so the term white opal should only be used where the body color is milky or white in appearance. Milky opal is the most common type of precious opal and is translucent with a creamy milky appearance.
Light opal is manly mined at Coober Pedy and Mintabie, South Australia, although the first deposits were mined at the White Cliffs in New South Wales.