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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.
Granite is a coarse-grained, light-colored igneous rock composed mainly of feldspars and quartz with minor amounts of mica and amphibole minerals. This simple definition enables students to easily identify the rock based upon a visual inspection.his chart illustrates the generalized mineral composition of igneous rocks. Granites and rhyolites (compositionally equivalent to granite but of a fine grain size) are composed mainly of orthoclase feldspar, quartz, plagioclase feldspar, mica and amphibole.