Mineral

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Amethyst, a variety o quartz

A mineral is a naiturally occurrin substance that is solid an stable at ruim temperatur, representable bi a chemical formula, uisually abiogenic, an haes an ordered atomic structur. It is different frae a rock, which can be an aggregate o minerals or non-minerals an daes nae hae a specific chemical composeetion. The exact definition o a mineral is unner debate, especially wi respect tae the requirement a valid species be abiogenic, an tae a lesser extent wi regards tae it havin an ordered atomic structur. The study o minerals is cried mineralogy.