<p>Exercise 3B: Mineral Identification</p><p>1. Separate minerals into light-colored minerals with non-metallic luster, dark- colored minerals with non-metallic luster, and minerals with metallic luster. Use both the flow charts found in this lab and the charts on pages 62-63 of your lab book to identify each mineral in your mineral box. When you have the name of the mineral, check out the mineral database on pages 61-68.</p><p>2. For each identified mineral, prepare an index card with the following information a. Name of mineral b. formula - indicate whether it is a silicate, an oxide, a carbonate, halide, or a sulfide c. hardness # -ONLY if it is a Moh’s hardness mineral, otherwise just indicate very soft (1+2), soft (3-5), hard (6-10) d. cleavage or fracture description if applicable, including # of cleavage planes and angle of cleavage planes if visible. Note: minerals like talc and kaolin have cleavage planes, but their crystals and cleavage planes are microscopic, so that cleavage is not a useful identifying characteristic. e. specific gravity- light, medium or heavy (heft) f. any other important identifying characteristics g. uses of the mineral (use online sources if your text or lab book has little)</p><p>3. Be able to identify the minerals in other boxes. It is important that you identify a mineral based upon its characteristic properties, rather than just by memorizing the mineral sample in your box. The sample that you will receive on your lab practical is likely to differ in size, shape and perhaps even color, but it will be identifiable by the characteristic properties of that mineral. Yellow color, gray streak, Pyrite cubic crystals</p><p>Gray color, High S.G. Magnetite Magnetic, gray streak h</p><p>Color red to silver, Hard H. 2-6 scratches Red-brown Hematite glass streak. Magnetic streak, cubic crystals</p><p>Metallic Luster Color silver, Very high S.G. Galena Cubic cleavage Soft does not scratch glass Color black or silver, gray streak Graphite Very soft Very low S.G.</p><p>Copper color, tarnishes brown Copper or green 2 cleavage planes at Plagioclase 90o, white or gray, Feldspar striations</p><p>2 cleavage planes at Potassium 90o, pink, white, gray Feldspar Cleavage Planes lamellae visible</p><p>Hexagonal crystal, Hard glassy luster, Quartz Scratches glass Cleavage conchoidal fracture Poor or absent</p><p>Olive green, looks sugary, many glassy Olivine crystals</p><p>Cubic cleavage, Halite glassy Light Color Non-metallic Luster Rhombohedral cleavage, reacts to Calcite acid, glassy Cleavage planes visible Scratches with fingernail, 2 good 1 Gypsum poor cleavage planes Soft Does not scratch Long needle-like glass crystals, glassy, very Kernite low S.G.</p><p>4 cleavage planes, Fluorite glassy Cleavage poor or absent 1 excellent cleavage Muscovite mica plane, elastic</p><p>Yellow, brittle, Chalky, very soft, Feels soapy, H. 1 low S.G., smells earthy May be pearly bad H. 1</p><p>Sulfur. Clay Talc (kaolinite, bentonite) Long black crystals, 2 cleavage planes Hornblende Cleavage Planes 60o and 120o visible</p><p>Green-black 2 Hard o cleavage planes 90 Augite Scratches glass blocky</p><p>Gray, black, 2 Plagioclase cleavage planes 90o Cleavage Feldspar Poor or absent Glassy, dark red, 12- sided crystal Garnet</p><p>Dark Color Non-metallic Sugary, olive green Olivine Luster</p><p>Cleavage planes visible One excellent cleavage plane, black, Biotite mica elastic Soft One excellent Does not scratch cleavage plane, glass Chlorite green, brittle</p><p>6 cleavage planes, Sphalerite smells bad Cleavage poor or absent</p><p>Rusty brown, Brown, earthy, Blue yellow-brown Green, not glassy with pea sized streak, earthy spheres</p><p>Azurite Limonite Malachite Bauxite</p>