Why it is important to understand …

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Minerals may occur in the cracks, crevices, faults or joints. The smaller occurrences are called veins or lodes. In most cases, they are formed when minerals in liquid, molten and gaseous forms are forced upward through cavities towards the earth's surface. They cool and solidify as they rise.Three main types of formations in which mineral occurs are : (i) Veins and lodes In igneous and metamorphic rocks minerals may occur in the cracks, crevices, faults or joints. Smaller occurrences are called veins and larger ones are called lodes.Minerals have several different ways in which they can form, which relate to the different ways that rocks can form: igneous minerals crystallize from molten rock, metamorphic minerals are recrystallized from other minerals without melting, and sedimentary minerals precipitate from water and, sometimes, from air.

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