Why is air not considered a mineral?

Glasses such as obsidian, which are disordered solids, liquids (e.g., water, mercury), and gases (e.g., air) do not have a crystalline structure and are therefore not minerals. ... A mineral has one specific chemical composition, whereas a rock can be an aggregate of different minerals or mineraloids.

A behavior that comes at a cost to the individual performing it and benefits another. Behavior any and all of the actions performed by an organism, often in repines to its environment or to the action of another organism. An action or signal on the part of one organism that alters the behavior of another organism.An innate sequence of behaviors, triggered under certain conditions, that requires no learning, does not vary, and once begun runs to completion; an example is egg-retrieval in geese. The process, extremely uncommon in nature, which brings about an increase in the frequency of alleles for traits (e.g., behaviors) that are beneficial to the persistence of the species or population while simultaneously being detrimental to the fitness of the individual possessing the trait (or engaging in the behavior).