Here's a breakdown:
* Cleavage: The tendency of a mineral to break along specific planes of weakness within its crystal structure. This results in smooth, flat surfaces that reflect light.
* Crystal Structure: Minerals are made up of repeating arrangements of atoms. These arrangements create planes where the bonds between atoms are weaker than in other directions.
* Breaking Along Cleavage Planes: When a mineral is subjected to stress, it will tend to break along these planes of weakness, resulting in the characteristic flat surfaces.
Examples of Minerals with Cleavage:
* Mica: Exhibits perfect basal cleavage, meaning it splits into thin sheets.
* Halite (Rock Salt): Has three perfect cleavage planes, forming cubic shapes.
* Feldspar: Usually shows two cleavage planes at nearly 90 degrees.
Note: Not all minerals exhibit cleavage. Some minerals, like quartz, have an irregular fracture pattern.
