When we first heard the word "cleavage" in class, everyone giggled. Cleavage is actually defined as how easily a mineral can split along flat surfaces. There are three general categories:
http://wiki.answers.com/Q/What_is_the_Definition_of_Rock_Cleavage
1) Perfect - when a mineral litterally splits in sheets. there are no uneven layers. An example of perfect rock cleavage is biotite
2) Good - when a mineral has some flat surfaces, and some rocky-er ones. Good rock cleavage can be found in talc
3) Poor - when a mineral crumbles or just breaks into clumps. You can easily find poor rock cleavage in quartz
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