Which rocks are best to use in a sweat lodge?

Rocks that are commonly used in sweat lodges include those that are heat-resistant and produce low levels of dust and harmful fumes when heated. Some suitable rock types include:

1. Soapstone: Soapstone is often highly valued for its ability to withstand high temperatures without cracking or releasing toxic substances. It generates consistent and mild heat, making it well-suited for sweat lodge practices.

2. Volcanic Rocks: Basalt, diorite, andesite, and granite are examples of volcanic rocks commonly used in sweat lodges. These rocks tend to retain heat well and release fewer impurities into the air.

3. Sandstone: Certain types of sandstone may be used, especially varieties low in quartz and free from contaminants. Heating sandstone with high quartz content should be avoided due to potentially hazardous gas emissions.

4. Quartzite: Quartzite, a metamorphic rock that results from the transformation of sandstone, can hold heat effectively and is durable against temperature fluctuations.

Selecting appropriate sweat lodge rocks involves researching local regulations and guidelines, as cultural preferences and considerations for the environment might influence which rocks are commonly employed in different places. Additionally, the quality and characteristics of individual rocks within the mentioned categories might vary based on the geological properties of your region.