Crystals from USA

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Crystals from the USA — Domestic Minerals Worth Collecting The United States has a rich mineral heritage spanning dozens of world-class localities. Herkimer diamonds — doubly terminated quartz crystals with exceptional clarity — come exclusively from Herkimer County, New York, where they form in Cambrian-age dolostone. The American Southwest produces turquoise from legendary mines like Sleeping Beauty (now closed), Kingman, and Bisbee in Arizona, and Cerrillos in New Mexico. Oregon sunstone, a copper-bearing plagioclase feldspar, is unique among gem materials for its vivid red, green, and bicolor play — found nowhere else on earth. Utah's Great Salt Lake region yields massive selenite blades with exceptional transparency. Arkansas produces fine quartz crystals from the Ouachita Mountains. Colorado's Sweet Home Mine is the world's most famous source of gem rhodochrosite. Tennessee produces exceptional fluorite, and the Lake Superior region yields spectacular agates and copper specimens. Each piece in this collection is sourced from verified American localities. Browse our Herkimer diamond specimens, or explore origins worldwide on our Interactive World Map . Compare with specimens from Brazil and Mexico . Free US shipping on orders over $150. Frequently Asked Questions What crystals come from the USA? Notable American minerals include Herkimer diamonds (New York), turquoise (Arizona, New Mexico, Nevada), Oregon sunstone, Arkansas quartz, Utah selenite, Colorado rhodochrosite, Tennessee fluorite, Lake Superior agate, and Montana sapphire. The US has hundreds of productive mineral localities spanning nearly every major mineral group. What are Herkimer diamonds? Herkimer diamonds are doubly terminated quartz crystals found in Herkimer County, New York. They form in Cambrian-age dolostone cavities and are known for exceptional clarity, natural double termination, and brilliant luster. They are not actual diamonds — they are quartz (Mohs 7) — but their diamond-like appear