When a mineral fractures along a cleavage plane, what does this suggest about the crystal structure of the mineral?
A) The crystal structure contains planes along which chemical bonding is much weaker than other directions.
B) The crystal contains warped planes called twin planes that weaken the crystal structure and allow it fracture along a planar surface, causing cleavage.
C) The atoms are arranged in a simple orderly arrangement with uniform bonding.
D) The crystal grows only planar faces that become weak zones that form cleavage.
A
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