The physical property denoting a mineral's tendency to crack along parallel, planar surfaces is known as cleavage.

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This statement is true. Cleavage is a physical property of minerals that refers to their tendency to break along flat planes or surfaces. This occurs due to the internal arrangement of atoms within the crystal lattice of the mineral. Different minerals can exhibit varying degrees and types of cleavage.

The Physical Property Denoting a Mineral's Tendency to Crack Along