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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.
(December 2009). In anatomy, a fissure (Latin fissura, plural fissurae) is a groove, natural division, deep furrow, elongated cleft, or tear in various parts of the body also generally called a sulcus, or in the brain a sulcus. Longitudinal fissure: found in the lower surface of the liver, also a fissure that separates the right and left hemispheres of the cerebrum. 2  Portal fissure: found in the under-surface of the liver. 3  Umbilical fissure: found in front of the liver.