Diatomite is a sedimentary rock formed by an accumulation of the phytoplankton diatom, a kind of algae. Noto is known for its production of diatomite; its reserve in Suzu City is the largest in Japan. Diatomite is very light due to its porous structure, and also resistant to fire and heat. Diatomite braziers are manufactured in Nanao City and Suzu City. Even when the inside of the brazier is heated, the outside temperature is kept to a level that will not cause a burn. Therefore, charcoal catches fire easily and keeps burning for a long time. While the charcoal is burning, the diatomite becomes red and emits infrared rays. Diatomite braziers are easy to use and make food delicious; they are very popular among people who enjoy outdoor cooking.