Cleavage and Fracture Minerals break in different ways depending on the arrangement of their atoms. Halite has three perfect cleavages that form at right angles to form cubes. Halite is commonly found in shades of white or clear but when impurities kick in it can be blue, purple, pink, yellow, or green. Halite is commonly found in massive and bedded aggregates as rock salt. Salton Sea Halite: Halite from the Salton Sea, California. 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. Quartz also lacks cleavage, while calcite exhibits excellent cleavage in three directions. Fracture is conchoidal. Magnetite. It also occurs in coarse, crystalline masses or in granular and compact forms. Cleavage / Fracture Samples Mineral Name Sample No. 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. No. Gypsum crystals only have one perfect cleavage direction. 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. OTHER SETS BY THIS CREATOR. When a mineral tends to break along a flat surface it is called cleavage. The other two cleavage directions are not as pronounced, so broken gypsum crystals tend to form rhomb-shaped fragments, rather than cubes. ... Cleavage is perfect in three directions forming cubes. As examples of minerals with cleavage we can give halite, calcite, gypsum, etc. Halite crystals are usually cubic. 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. Halite: Non-metallic: Softer than glass: 3 perfect cleavages at 90°; Tastes like salt, feels greasy. Its chemical name is sodium chloride, and a rock composed primarily of halite is known as "rock salt." Halite, better known as rock salt, can easily be distinguished by its taste. Name the mineral commonly known as "Fools Gold" Pyrite. Quartz is a mineral that shows fracture rather than cleavage. Halite has cleavage. 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. ... Halite. Minerals and Rocks, Rocks and Minerals. An example of CLEAVAGE is: Mica & Halite. Cleavage, fracture and crystal form are defined in the pre-lab reading questions above. CLEAVAGE and FRACTURE describe: The way the mineral breaks. CLEAVAGE is: The tendency of some minerals to break along flat surfaces. Cubic Cleavage: Not surprisingly, cubic cleavage is three directions of cleavage with planes mutually at 90 o to each other. An unidentified mineral that is softer than calcite, exhibits a metallic luster, and cubic cleavage. As another important difference between cleavage and fracture, we can say that cleavage is regular, but fracture is irregular. Name a magnetic mineral. The mineral most likely is... (Pyrite, Galena, Halite, Pyroxene) Cleavage relates to geometric patterns that develop by breaking the mineral into pieces. Galena, halite, and sylvite are examples. Halite is the mineral name for the substance that everyone knows as "salt." 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. Of cleavage with planes mutually at 90 o to each other give,... 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