The mineral known for its exceptional resistance to heat is asbestos. Asbestos is a fibrous mineral that has been widely used in the past for insulation, fireproofing, and other industrial applications due to its durability and heat-resistant properties. It can withstand high temperatures without degrading, making it suitable for fire-retardant materials. However, asbestos is also known to pose serious health risks, including lung disease and cancer when inhaled. As a result, its use has been significantly restricted or banned in many countries, and safer alternatives are now favored for heat-resistant applications.