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Microorganisms can precipitate metals from solution, contributing to the formation of ore deposits.To date over 80,000 liquid crystalline compounds have been identified.they help to define the limits of what constitutes a mineral proper.The formal Nickel (1995) definition explicitly mentioned crystallinity as a key to defining a substance as a mineral.A 2011 article defined icosahedrite, an aluminium-iron-copper alloy as mineral; named for its unique natural icosahedral symmetry, it is a quasicrystal.

Skinner expanded the previous definition of a mineral to classify "element or compound, amorphous or crystalline, formed through biogeochemical processes," as a mineral.