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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.
The Difference Between Cracks and Fissures in Granite. When choosing a granite slab or perhaps admiring your newly installed countertops, you may notice intermittent lines in the stone.Do not panic! Some people assume that these are cracks and that the integrity of their countertops will be compromised, but in most cases there is nothing to worry about.The difference between a crack and a natural granite fissure is an important aspect of enjoying the natural beauty of granite.A fissure in a slab of granite is a natural cleft in the rock caused by God or âNatureâ.When the stones form underground, a gap may develop in the material for any number of reasons, and this gap presents as a fissure when the slabs are mined from the ground.o not panic! Some people assume that these are cracks and that the integrity of their countertops will be compromised, but in most cases there is nothing to worry about. The difference between a crack and a natural granite fissure is an important aspect of enjoying the natural beauty of granite.