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August 3, 2007, Newsletter Issue #150: Cleavage vs. Crystal Shape
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Tip of the Week
It can be hard to decide whatīs a cleavage surface, and whatīs a crystal face. Crystal shape has to do with the way a mineral will "grow" if it has enough room. (If it is crowded, the crystal shape might be clear only under a microscope, not in a hand specimen). Cleavage, on the other hand, refers to the way a mineral breaks - if you whack it with a hammer, does it break into cubes? Does it always break so that itīs like a sheet of paper? Thatīs cleavage. Some minerals donīt really have cleavage, they donīt always break a certain way. But others, for example, pyrite, break alone certain preferred planes. A cube of pyrite, if you whack it with a hammer, with break into - little cubes of pyrite. Thatīs cleavage, in the case of a cube, itīs cleavage in three directions.
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