what colour is used to represent the minerals in map
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Color is used on geologic maps to delineate the distribution of various rocks (stratigraphy, lithology) and other features. It is also employed to advantage on other specialized maps that deal with aspects of geomorphology (physiography), structure, mineral deposits, soils, hydrology, and bathymetry. The requirements of a good color map include legibility, economy of production, and good taste. Tradition often prescribes certain associations of color with particular implications, which being thus established, control other associations. Dark colors are often used for igneous rocks, light shades for sedimentary.
Understanding the rationale of map coloring requires some general knowledge of colors. There are three primary colors —red, blue, and yellow. They may be more accurately referred to in terms of pigments or, in printing, as process colors: magenta, cyan, and yellow. If pairs of these colors are combined in equal volumes, they yield the standard secondary colors: purple, orange,..