what are the different mode of occurrence of minerals ? from geography 10th class
Answers
✔️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 earth’s surface. Examples: tin, copper, zinc, lead, etc.
2️⃣In 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.
3️⃣By 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.
4️⃣As 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.
5️⃣In 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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Answer:
Minerals in Igneous and Metamorphic rocks:- The minerals are found in crevices, faults or joints. They are found either in solid or liquid or gaseous state. Eg- Tin, copper, zinc, lead etc.
Minerals in decomposed rocks:- This involves the decomposition of surface rocks, and the removal of soluble constituents, leaving a residual mass of weathered material containing ores. Eg- Bauxite.
Minerals in alluvial deposits:- These deposits are called placer deposits and generally contain minerals which are not corroded by water. Eg- Gold, silver, tin, platinum etc.
Minerals in sedimentary rocks:- These occur in beds or layers. They are formed as a result of desposition accumulation and concentration in horizontal stratas. Eg- Coal, gypsum, potas,sodium salt,etc.
Minerals in ocean water:- These are mostly diffused to be of economic significance. Ocean water contain vast quantities of minerals. Eg- NaCl, magnesium, bromine, manganese etc.