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X-ray diffraction patterns of fecal samples KV152, KV147, KV145, and KV136. Letter codes: Ch = chalcopyrite, CuFeS2; Vl = villamaninite, CuS2; Gy = gypsum, CaSO4; Cc = calcite, CaCO3. The diagnostic peaks for muscovite (♦), clinochlore (■), quartz (◊), and albite (+) are indicated. The vertical bar shows the scale of relative counts.
