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Fissures in Granite Countertops. Fissures in granite are incredibly common, especially in slabs with a large dramatic design. In the slab yard, with the slab sitting vertically, these fissures are present and yet not so easily recognized.In the excitement of choosing an exquisite slab it's easy to stand back and focus on the slab as a whole instead.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.
Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite has a medium to coarse texture, occasionally with some individual crystals larger tha â¦ n the groundmass forming a rock known as porphyry.Granites can be pink to dark gray or even black, depending on their chemistry and mineralogy. Outcrops of granite tend to form tors, and rounded massifs.ranite is hard to scratch with a fingernail.   2. Basalt is formed from lava that cooled rapidly, so it has a fine-grained texture. Its mineral grains are so tiny that they can be seen only through a microscope. It may be black or dark green. It contains the minerals feldspar and olivine.