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Cleavage_and_Fracture - that has a different orientation is...

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Cleavage and Fracture Cleavage is the tendency of some minerals to break along regular planes of weak bonding between atoms in the internal crystalline structure (see Figure 1.15). When broken, minerals that exhibit cleavage produce smooth, flat surfaces, called cleavage planes. Cleavage is described by (1) noting the number of directions of cleavage, which is the number of different sets of planes that form the surfaces of a mineral crystal when it cleaves, and (2) the angle(s) at which the directions of cleavage meet (see Figure 1.15). Each cleavage plane of a mineral crystal
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Unformatted text preview: that has a different orientation is counted as a different direction of cleavage. When two or more cleavage planes are parallel or line up with each other, they are counted only once, as one direction of cleavage. Minerals may have one, two, three, four, or six directions of cleavage. Figure 1.17 Figure 1.17 Common cleavage directions of minerals. (After AG/NAGT, Laboratory Manual in Physical Geology, 2nd ed., New York: Macmillan Publishing Company, 1990.)...
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