Large Smithsonite crusts are found in a number of areas on the island of Sardinia, Italy, particularly at the Massua and Monteponi Mines, in Iglesias. Blue-green botryoidal masses and crusts are common at the mines at Lavrion, Greece.
Individual Smithsonite crystals and crystal clusters of all colors are well-known from Tsumeb, Namibia. Two other African localities which provided visible crystals of this mineral are Berg Aukas, Grootfontein, Namibia; and the Kabwe Mine (Broken Hill), Zambia. The famous Australian locality of Broken Hill, New South Wales, is known for its abundance of minerals including Smithsonite.
Mexico has two outstanding Smithsonite localities which contain beautifully colored Smithsonite, including deep pink and electric green colors. These are the Refugio Mine, Choix, Sinaloa; and the San Antonio Mine, Santa Eulalia District, Chihuahua.
The U.S. has many fine Smithsonite occurrences; perhaps the most famous being the Kelly Mine, Magdalena, Socorro Co., New Mexico. The No. 79 Mine, Hayden, Gila Co., Arizona is known for its dark and apple-green Smithsonite. Bright yellow and orange-yellow specimens have come from Rush, near Yellville, Marion Co., Arkansas. A large industrial zinc deposit produced Smithsonite in Leadville, Lake Co., Colorado. Other localities are Cerro Gordo, Inyo Co., California; the Hidden Treasure Mine, Ophir Hill, Tooele Co., Utah; and Mineral Point, Iowa Co., Wisconsin.