California:
* The Franciscan Complex: This geological formation, running along the coast from San Francisco to Los Angeles, is known for its jadeite deposits. The most famous site is the New Idria District in the Diablo Range near the town of Idria. Other locations include the Santa Lucia Mountains and the San Benito County.
* Clear Creek: Located near the city of Redding, this area has produced some notable jadeite specimens.
Alaska:
* The Seward Peninsula: This area, particularly near the Council Mining District, has produced high-quality jadeite, including some with a distinctive "mottled" appearance.
Other Locations:
While less common, jadeite has also been found in small quantities in:
* Oregon
* Washington State
It's worth noting that jadeite is a relatively rare gemstone, and while it's found in these locations, finding high-quality material suitable for jewelry is a challenge.
For more detailed information on specific locations and the history of jadeite mining in the US, you can consult geological surveys and mineralogical publications.
