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| 1. |
Write down the major physical characteristics of minerals |
| Answer» 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\xa0cleave\xa0in 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\xa0impurities\xa0quartz may be white, green, red, yellow etc.<br>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\xa0in 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\xa0impurities\xa0quartz may be white, green, red, yellow etc. | |