A certain mineral was able to catch on fire. The ability to catch on fire is a property

The answer is chemical. Flammability is a chemical property

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).