It is found in western Utah, in the Thomas Mountain Range near the city of Milford in Beaver County.
It is also known as Bacon Opal, Hyalite Opal and several other names. The gemstone cabochons are slightly translucent (usually in the clear bands!) and have red, white, pink and yellow stripes.
Opal that is mostly opaque, with no play of color, is actually quite common. Opal is a hydrated silica material and it has a hardness of 5.5 to 6.5.
The name Opal comes from the Latin word opalus which means "precious stone".
Candy Opal comes from the Milford Opal mine, which was leased from the state and was offered for fee mining, but I have heard the claim was closed in May 2018.
Update: As of December of 2019, Mark and Pam Marriott of Rock Dreams LLC have the claim and are again doing pay for digs. The claim is called the Bubble Opal Claim and the material is also called Bubble Opal, Halite Opal, Lace Opal and Wildfire Opal.
Candy Opal or Common Opal cabochons are said to be calming stones that soothe the emotional body and promote a more positive outlook.