A measure of the ease with which a smooth surface of a mineral can be scratched, or of its resistance to abrasion. In 1822 the Austrian mineralogist Friedrich Mohs devised a scale based on one mineral's ability to scratch another.He placed 10 minerals in order from softest to hardest, giving a relative hardness value of 1 to the softest mineral, and 10 to the hardest.ather, it is a method of gauging the relative hardness of a mineral. If a mineral cannot be scratched by a knife blade but can be scratched by quartz then its hardness is between 5 and 7 (stated as 5-7) on Mohs scale.
Insects in the family Tettigoniidae are commonly called katydids or bush crickets. More than 6,400 species are known. Part of the suborder Ensifera, Tettigoniidae is the only family in the superfamily Tettigonioidea. Primarily nocturnal in habit, with strident mating calls, many katydids exhibit mimicry and camouflage, commonly with shapes and colors similar to leaves.
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