Physical Characters ÷Malleable(可锻when slices from it will flatten under a hammer; tough,when great resistance to tearing apart under strain or a blow is shown; Ductile(延展性，when it can be drawn into wire. Hardness --The resistance of a smooth plane,whether crystal,cleavage,or fracture,to abrasion is called the hardness,and is commonly determined by scratching the surface.It is expressed in terms of a scale of ten common minerals (Mohs scale).Each mineral will scratch all those softer than itself. Physical Characters  Malleable(可锻性) when slices from it will flatten under a hammer;  tough, when great resistance to tearing apart under strain or a blow is shown;  Ductile(延展性), when it can be drawn into wire.  Hardness -- The resistance of a smooth plane, whether crystal, cleavage, or fracture, to abrasion is called the hardness, and is commonly determined by scratching the surface. It is expressed in terms of a scale of ten common minerals (Mohs scale). Each mineral will scratch all those softer than itself