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What is the mode of occurrence …

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What is the mode of occurrence of minerals?

    • Posted by Pride Gaurav 6 years, 11 months ago

    CBSE > Class 10 > Social Science
    • 1 answers

    Gaurav Seth 6 years, 11 months ago

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    • In igneous and metamorphic rocks:The smaller occurrences are called veins and the larger occurrences are called lodes. They are usually formed when minerals in liquid/molten and gaseous forms are forced upwards through cavities towards the earths surface. Examples: tin, copper, zinc, lead, etc.
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    • In sedimentary rocks:In these rocks, minerals occur in beds or layers. Coal, iron ore, gypsum, potash salt and sodium salt are the minerals found in sedimentary rocks.
    • By decomposition of surface rocks:Decomposition of surface rocks and removal of soluble constituents leaves a residual mass of weathered material which contains ores. Bauxite is formed in this way.
    • As alluvial deposits:These minerals are found in sands of valley floors and the base of hills. These deposits are called placer deposits. They generally contain those minerals which are not corroded by water. Examples; gold, silver, tin, platinum, etc.
    • In ocean water:Most of the minerals in ocean water are too widely diffused to be of economic importance. But common salt, magnesium and bromine are mainly derived from ocean waters.

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