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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.
Fissures are tiny edges in the composition of the minerals that your countertops are built of. Fissures are present in a good portion of the granite, marble, and travertine slabs that are available. They often help make up the artistic look of the slab you chose.ctual cracks will be different in composition than fissures. Cracks are not solid, so they will have an opening that debris can fall into. If you find cracks like the one shown below in your countertop, your granite company should be able to help you fill and hide them from view.