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Opal has a form of existence in the form of a solid colloidal solution of the two minerals. All of this is a logical product of life minerals. Although they do not necessarily have a crystalline structure and are not necessarily the individual chemicals, they can not be excluded from consideration of the phenomena of mineral and removed from the mineralogy. Also to direct, but complementary facilities include mineralogy rocks, ores, mineral deposits and other geological features, as out of touch with them mineralogy not only loses its meaning of geological science, but most importantly, deprived primary source of information about the conditions of mineral formation in nature. All this is mandatory objects of mineralogy. At the same time the ice (mineral, according to our definition) isobject of of Glaciology and Soil , is now common objects of different sciences. more info >>
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