Science Olympiad: Rocks and minerals Rated A+

Science Olympiad: Rocks and minerals Rated A+ Albite H: 6.0, S.G: 2.63. A silicate (NaAlSi3O8) a widely distributed rock-forming feldspar. Generally white or light colore. Two directional cleavage. Almandine H:6.5-7.5, S.G:4.31. Color deep purplish red. Usually found in metamorphic rock. a deep red garnet consisting of iron aluminum silicate Amazonite H: 6.0, S.G: 2.5-2.6, Luster: Glassy-vitreous, Color: Green, white, flesh. The only green feldspar Apatite H 5.0, S.G. 3.1-3.2 Luster: vitreous, Color: colorless, white, brown, green, violet, blue or yellow. Hexagonal crystals and color help distinguish. Looks like Beryl, but not as hard. Used as source of phosphate in fertilizer. Aragonite CaCO3 H:3.5-4, S.G: 2.9-3.0 Color: white, light tan, or colorless. Bubbles in cold hydrochloric acid (HCl). Often occurs as a white branching, coral-like growth. Found in caves and near hot springs. Augite H: 5-6, S.G: 3.2 - 3.6 The pyroxene group of minerals are very important as they are a major rock forming mineral. Can be identified by its two directional cleavage at nearly 90 degrees. Azurite Cu3(CO3)2(OH)2 H: 3.5-4.0. S.G. 3.8 Luster: Glossy Color: light blue to almost black. _______ is identified by its blue color and low hardness. Most other minerals are much harder than this. _____ is a carbonate that dissolves in HCL with bubbles given off. It is a secondary copper mineral. Bauxite H 1-3 S.g 2-2.5 Luster: dull It is the main ore for production of aluminum. Note the obvious nodules. Barite H 3-3.5 S.G. 4.3-4.6 Streak: White, Color: white or colorless mineral (BaSO4). Can be bluish, yellow, brown or reddish. A heavy mineral that can be recognized by its specific gravity (SG). Quartz is harder and not as heavy Beryl H 8.0, S.G. 2.6-2.8 Luster: glassy Mostly occurs in pegmatite rocks. Has a hexagonal crystal shape. Colors vary from white, blue, yellow, green and pink. Hardness, color, crystal shape identify. Special gem names blue and blue-green: aquamarine, pink: morganite, green: emerald the chief source of beryllium