"2013-10-05T12:37:41Z"^^ . "ENVO:01000256"^^ . "From Wikipedia: [A mineral] is different from a rock, which can be an aggregate of minerals or non-minerals and does not have a specific chemical composition. The exact definition of a mineral is under debate, especially with respect to the requirement a valid species be abiogenic, and to a lesser extent with regards to it having an ordered atomic structure."^^ . . . "ENVO"^^ . "pbuttigieg"^^ . "mineral"^^ . "A mineral is an environmental material which is naturally occurring, solid and stable at room temperature, representable by a chemical formula, usually abiogenic, and has an ordered atomic structure."^^ .