Specific Features of Mineralogy 831 Methods Used in Mineralogical Analysis 834 Methods Used in the Quantitative X-Ray Determination of Quartz and Carbonate Minerals 834 Specific Features of Geochemistry 835 Methods Used in Geochemical Determinations 840 Spectral Method for Determination of Oxides 841 Determination of Chromium, Nickel, Cobalt, Lead, Manganese, Titanium, Zirconium, Copper and Molybdenum By the Spectral Analyses Method 843 X-Ray Diffraction Method for the Study of Clay Minerals 843 Methods for the Determination of Zinc 844 Methods for Determination of Copper and Nickel 845 Methods for Determination of Cadmium, Copper Nickel and Zinc by Atomic Absorption 845 Gamma-Ray Spectrometry 846