Crystalline solids usually have a clearly defined melting point, while some solids, like glass and plastic do not. These types of substances are sometimes called "pseudo solids". Other substances which appear solid but can become fluid (like paint or glue) when touched are sometimes referred to as "pseudo solids".
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It hav definite geometrical shape, sharp melting point, it possess long range order, on cutting it gives regular cleavage. So crystalline solids are called True solids
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