Localities in which caledonite occurs as well developed crystals are quite rare and include the Mammoth-St. Anthony Mine at Tiger, Arizona, a few mines in California, such as the Reward Mine.
Localities in which caledonite develops into such beautiful crystals are quite rare: the best known samples come from the Mammoth-St. Anthony Mine at Tiger, AZ, and relatively few exist. Other fantastic examples can be found from a few mines in California, such as the Reward Mine.