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What Is a Fissure. Granite is an igneous rock, which means it was created from hot lava flow from a volcano. Fissures are thin, nonstructural cracks that occur during the formation process of the granite.When two separate streams of molten lava or magma intersect, they can leave behind a small separation between them.ome types of granite like Absolute Black, which is a classification of stone known as a gabbro, rarely develop fissures, because the material making up the stone is extremely dense. Some types of granite, however, containing the mineral serpentine are extremely prone to fissures.
Definition of fissure. 1 : a narrow opening or crack of considerable length and depth usually occurring from some breaking or parting a fissure in the earth's crust. 2a : a natural cleft between body parts or in the substance of an organb : a break or slit in tissue usually at the junction of skin and mucous membrane.