Fissility (geology)
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Fissility refers to the property of rocks to split along planes of weakness into thin sheets.[1] This is commonly observed in shales, which are sedimentary rocks, and in slates and phyllites, which are foliated metamorphic rocks. The fissility in these rocks is caused by the preferred alignment of platy phyllosilicate grains due to compaction, deformation or new mineral growth.[2]
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