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Mineral
  In general, a Mineral is a chemical substance, normally in crystalline form, that was formed as a result of a geological process.
In chemistry, Minerals are native, inorganic compounds or the inorganic content of fossilized organic substances, that have a defined chemical composition.
  Also the term mineral includes:

metamict substances (naturally occurring, formerly crystalline substances whose crystallinity has been destroyed by ionizing radiation),
naturally occurring amorphous substances that have never been crystalline ('mineraloids') such as georgite and calciouranoite
biogenic mineral substances formed by the action of geological processes on bigenic compounds

  Examples of minerals include:

biogenic minerals
diatomaceous earth
mineral nutrients
native element minerals

Some mineral classes

carbonate minerals (carbonates)
halide minerals (halides)
oxide minerals (oxides)
phosphate minerals (phosphates)
silicate minerals (silicates)

hydrated silica

sulfate minerals (sulfates)
sulfide minerals (sulfides)
Some specific examples include:

azurite
disodium tetraborate
disodium tetraborate decahydrate
disodium tetraborate octahydrate
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