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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.
fissure. 1. Anatomy a narrow split or groove that divides an organ such as the brain, lung, or liver into lobes. 2. a small unnatural crack in the skin or mucous membrane, as between the toes or at the anus. 3. a minute crack in the surface of a tooth, caused by imperfect joining of enamel during development. [ â²fishÂ·Ér ].