Lab 9 - 3 ), Dolomite (CaMg(CO 3 ) 2 ), Siderite (FeCO 3 ),...

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Geology 318: Mineralogy El-Shazly, 2002 Lab 9 1- List the optical properties of the following minerals: Olivine (3 thin sections: Olivine, OLV, and 44-5153). Topaz Barite Aragonite (WC-2) 2 Optical properties of carbonates: The mineral aragonite has the formula CaCO 3 . Unlike Calcite, aragonite is orthorhombic. Minerals that share some of the optical properties of aragonite (known as the aragonite isostructural group) include strontianite (SrCO 3 ), witherite (BaCO 3 ) and Cerussite (PbCO 3 ). On the other hand, minerals sharing many of the optical properties of calcite include: Magnesite (MgCO
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Unformatted text preview: 3 ), Dolomite (CaMg(CO 3 ) 2 ), Siderite (FeCO 3 ), and Rhodochrosite (MnCO 3 ). (a) Examine the samples of dolomite and siderite provided, carefully listing the optical properties of each mineral. (b) Summarize on a separate sheet of paper the optical properties common to each of the carbonate groups, and the main differences between each (calcite group, vs. aragonite group). (c) Explain the differences between the minerals calcite, dolomite, and siderite. How can you tell these three minerals apart in thin section ?...
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