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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 of Rolando central sulcus of cerebrum. sphenooccipital fissure the fissure between the basilar part of the occipital bone and the sphenoid bone. sylvian fissure, fissure of Sylvius one extending laterally between the temporal and frontal lobes, and turning posteriorly between the temporal and parietal lobes.. porta hepatis. 2. the transverse cerebral fissure between the diencephalon and the cerebral hemispheres; called also fissure of Bichat. zygal fissure any of the fissures on the cerebral cortex that consist of two branches connected by a stem.