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Properties that help geologists identify a mineral in a rock are: color, hardness, luster, crystal forms, density, and cleavage. Crystal form, cleavage, and hardness are determined primarily by the crystal structure at the atomic level. Color and density are determined primarily by the chemical composition.
Regarding this, what are the composition and crystal structure of minerals?
Minerals have specific chemical compositions, with a characteristic chemical structure. Minerals are solids that are formed naturally through inorganic processes. Chemical composition and crystal structure determine a mineral's properties, including density, shape, hardness, and color.
Additionally, do all minerals have crystal structures?
Yes, all minerals have crystal structures, quite simply because minerals are DEFINED as having definite crystal structures. There are, however, many different naturally occurring substances made out of the same things as minerals that are very mineral-like, that are not crystals.
While growing, minerals may develop a distinct crystal form with smooth, flat planes called crystal faces. The geometric pattern of the crystal faces reflects the internal atomic arrangement of the crystal structure. This is one of the most important things about a mineral.