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A mineral is a naturally occurring substance, representable by a chemical formula, that is usually solid and inorganic, and has a crystal structure.It is different from a rock, which can be an aggregate of minerals or non-minerals and does not have a specific chemical composition.ommon distinguishing characteristics include crystal structure and habit, hardness, lustre, diaphaneity, colour, streak, tenacity, cleavage, fracture, parting, and specific gravity. More specific tests for minerals include magnetism, taste or smell, radioactivity and reaction to acid.
A rock is composed of combinations of minerals, each mineral having its own chemical formula and crystalline structure.Minerals are composed of an element or combination of elements. rock is combinations of minerals and either has to be an igneous, metamorphic, or sedimentary rock. A mineral is a solid that was formed in nature, has a definite chemical â¦ makeup, and has a crystal structure.