Examlex
Dates that include years both before and after the year 2000 should be formatted with a two-digit year.
Cleavage
In geology, the tendency of crystalline materials to split along definite crystalline boundaries, creating smooth surfaces.
Hardness
A measure of a mineral's resistance to scratching, which aids in identifying minerals in field and lab settings.
Ionic
Relating to or involving ions, which are atoms or molecules with a net electric charge due to the loss or gain of one or more electrons.
Covalent
referring to chemical bonds formed by the sharing of electron pairs between atoms.
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