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Minerals And Rocks
Question
Explain any five physical characteristics of minerals.
Solution
Followings are the physical characteristics of minerals:
(i)External crystal form — determined by internal arrangement of the molecules — cubes, octahedrons, hexagonal prisms, etc.
(ii)Cleavage — tendency to break in given directions producing relatively plane surfaces — result of internal arrangement of the molecules — may cleave in one or more directions and at any angle to each other.
(iii)Fracture — internal molecular arrangement so complex there are no planes of molecules; the crystal will break in an irregular manner, not along planes of cleavage.
(iv)Lustre — appearance of a material without regard to colour; each mineral has a distinctive lustre like metallic, silky, glossy etc.
(v)Colour — some minerals have characteristic colour determined by their molecular structure — malachite, azurite, chalcopyrite etc., and some minerals are coloured by impurities. For example, because of impurities quartz may be white, green, red, yellow etc.
(i)External crystal form — determined by internal arrangement of the molecules — cubes, octahedrons, hexagonal prisms, etc.
(ii)Cleavage — tendency to break in given directions producing relatively plane surfaces — result of internal arrangement of the molecules — may cleave in one or more directions and at any angle to each other.
(iii)Fracture — internal molecular arrangement so complex there are no planes of molecules; the crystal will break in an irregular manner, not along planes of cleavage.
(iv)Lustre — appearance of a material without regard to colour; each mineral has a distinctive lustre like metallic, silky, glossy etc.
(v)Colour — some minerals have characteristic colour determined by their molecular structure — malachite, azurite, chalcopyrite etc., and some minerals are coloured by impurities. For example, because of impurities quartz may be white, green, red, yellow etc.
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Some More Questions From Minerals And Rocks Chapter
Write some main sedimentary rocks.
Which important minerals are found in metamorphic rocks?
State one example of hard rock and soft rock.
The process of physical and chemical changes affecting sediments during their conversion into solid rocks.
Structure in metamorphic rocks in which minerals are drawn out into long, thin pencil like objects all in parallel alignment.
The smooth planer surfaces of weakness along which minerals have pronounced tendency of split.
Few large crystals imbedded into material of smaller crystals.
What do you mean by rocks ? Name the three major classes of rocks.
What is an igneous rock? Describe the method of formation and characteristics of igneous rock.
What relationship is explained by rock cycle between the major types of rock?
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