Cleavage and Fracture Minerals break in different ways depending on the arrangement of their atoms. Minerals and Rocks, Rocks and Minerals. Name the mineral commonly known as "Fools Gold" Pyrite. No. Its chemical name is sodium chloride, and a rock composed primarily of halite is known as "rock salt." Quartz also lacks cleavage, while calcite exhibits excellent cleavage in three directions. An example of CLEAVAGE is: Mica & Halite. Halite, better known as rock salt, can easily be distinguished by its taste. Cleavage, fracture and crystal form are defined in the pre-lab reading questions above. If one cleavage plane is observed parallel to a (100) in a cubic crystal, the symmetry of the isometric system requires that there be two more planes at right angles to the observed plane. Magnetite. An unidentified mineral that is softer than calcite, exhibits a metallic luster, and cubic cleavage. Halite: Non-metallic: Softer than glass: 3 perfect cleavages at 90°; Tastes like salt, feels greasy. Halite has cleavage. Salton Sea Halite: Halite from the Salton Sea, California. When a mineral tends to break along a flat surface it is called cleavage. ... Cleavage is perfect in three directions forming cubes. MINERAL Cleavage Fracture MINERAL Cleavage Fracture Halite (20) Muscovite (Mica) (1) Calcite (23) Pink Feldspar (30) Gypsum (22) Rose Quartz (8) 4 The shape of mineral fragments produced by cleavage and fracture can affect the potential danger if inhaled. Sometimes, halite may form “hopper” crystals in which the outer edges of the cube faces have grown more rapidly than their centers, leaving cavernous faces. CLEAVAGE and FRACTURE describe: The way the mineral breaks. As examples of minerals with cleavage we can give halite, calcite, gypsum, etc. Cleavage / Fracture Samples Mineral Name Sample No. Name a magnetic mineral. It also occurs in coarse, crystalline masses or in granular and compact forms. Gypsum: Non-metallic: Softer than glass and softer than a fingernail: Generally clear to white; One perfect cleavage, may show up to 3 cleavages; Easily scratched with a fingernail. ... Halite. Quartz is a mineral that shows fracture rather than cleavage. Halite crystals are usually cubic. Gypsum crystals only have one perfect cleavage direction. Cleavage relates to geometric patterns that develop by breaking the mineral into pieces. Halite: Halite has distinct cubic cleavage, and although it may resemble the clear rock crystal variety of quartz, the two can be distinguished by halite s distinctive taste, cleavage and softness. CLEAVAGE is: The tendency of some minerals to break along flat surfaces. Halite is commonly found in massive and bedded aggregates as rock salt. Since taste is an important property of salt, there is a right way to taste a specimen of halite (or an unknown mineral that is similar to halite) and a wrong way. Galena, halite, and sylvite are examples. The other two cleavage directions are not as pronounced, so broken gypsum crystals tend to form rhomb-shaped fragments, rather than cubes. Fracture is conchoidal. Halite is the mineral name for the substance that everyone knows as "salt." As another important difference between cleavage and fracture, we can say that cleavage is regular, but fracture is irregular. Halite is commonly found in shades of white or clear but when impurities kick in it can be blue, purple, pink, yellow, or green. OTHER SETS BY THIS CREATOR. Cubic Cleavage: Not surprisingly, cubic cleavage is three directions of cleavage with planes mutually at 90 o to each other. The mineral most likely is... (Pyrite, Galena, Halite, Pyroxene) Halite has three perfect cleavages that form at right angles to form cubes. 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