North America:
* United States: Arizona, California, Colorado, Idaho, Montana, Nevada, Oregon, Utah, Washington, Wyoming.
* Mexico: Chihuahua, Sonora.
* Canada: British Columbia, Ontario.
South America:
* Brazil: Bahia, Rio Grande do Sul.
* Uruguay: Artigas, Rivera.
Europe:
* Germany: Idar-Oberstein.
* Czech Republic: Bohemia.
* England: Cornwall.
* Scotland: The Isle of Skye.
* France: Auvergne, Languedoc-Roussillon.
* Italy: Sicily, Tuscany.
* Spain: Andalusia.
Asia:
* India: Gujarat, Rajasthan.
* China: Xinjiang, Inner Mongolia.
* Japan: Hokkaido.
* Thailand: Chanthaburi.
* Madagascar: Antsiranana.
Africa:
* Namibia: Tsumeb.
* South Africa: Northern Cape.
* Morocco: Erfoud.
* Madagascar: Antsiranana.
Australia:
* Queensland: Chinchilla.
* Western Australia: Kalgoorlie.
Oceania:
* New Zealand: North Island, South Island.
This is not an exhaustive list, and chalcedony can be found in many other locations. The specific types and qualities of chalcedony vary depending on the location and geological conditions.
For example, agate is a type of chalcedony that is often found in geodes. Agates are mined in many of the locations mentioned above, but they are particularly well known from Brazil and Uruguay.
It's worth noting that the mining of chalcedony can have environmental impacts, so it's important to consider the sustainability of its extraction.
