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Rock Forming (nonclay)Minerals <br /> Quartz <br /> Quartz(SiO2) is the most common rock-forming mineral. <br /> K-Feldspar <br /> K-Feldspar (KAlSi3O8) is a potassium bearing feldspar and can be Orthoclase, Microcline or <br /> Sanidine. <br /> Plagioclase <br /> Plagioclase is a mineral series ranging in composition from Albite (NaAlSi3O8) to Anorthite <br /> (CaAl2Si2O8) and is one of the most common rock forming mineral groups. <br /> Sillimanite <br /> Sillimanite (Al2SiO5) is chemically the same as andalusite and kyanite but these three minerals <br /> all have different crystal structures. Sillimanite is common in metamorphosed sedimentary <br /> rocks. <br /> Calcite <br /> Calcite is a common hexagonal carbonate mineral with the formula CaCO3. <br /> Dolomite <br /> Dolomite is a hexagonal carbonate mineral with the formula CaMg(CO3)2 . <br /> Siderite <br /> Siderite is a hexagonal carbonate mineral with the formula FeCO3. <br /> Pyrite <br /> Pyrite (FeS2) is an iron sulfide iron sulfide with a cubic crystal structure. Pyrite is also known as <br /> fool's gold. <br /> Reference for general mineral definitions: Dictionary of Geological Terms, American Geological Institute, 1976, Anchor <br /> Press/Doubleday,Garden City,New York. <br /> K/T GeoServices Report Z23032 Page 3 of 10 February 17,2023 <br />