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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.
Full Definition of FISSURE. 1. : a narrow opening or crack of considerable length and depth usually occurring from some breaking or parting.2. a: a natural cleft between body parts or in the substance of an organ b: a break or slit in tissue usually at the junction of skin and mucous membrane.. : a narrow opening or crack of considerable length and depth usually occurring from some breaking or parting. 2.