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minerals

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Minerals  are substances that are formed naturally in the Earth.  Minerals  are usually solid, inorganic, have a crystal structure, and form naturally by geological processes. The study of  minerals  is called mineralogy. A  mineral  can be made of single chemical element or more usually a compound.       TYPES               With over 3,000  different types of minerals  a system is needed to make sense of them all. ... The Dana system divides  minerals  into eight basic classes. The classes are: native elements, silicates, oxides, sulfides, sulfates, halides, carbonates, phosphates, and mineraloids.      MINERALSMINERALS