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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.
I stood at the foot of the waterfall, looking up at the fissure from which it issued. As well as I was able I crept into the fissure and felt one foot on a piece of iron. One of these, the fissure Spring, is a hundred feet long and from four to ten feet wide. He has the cunning of a serpent, and he will escape through some fissure in the rock. If it is permitted to remain in the fissure for any time, it hardens, and only great dikes are formed. A sand crank is a fissure in the horn of the wall of the foot. But the pillar which is built as a filled-up tower is of course liable to fissure in any direction, if its cement give way.