(A) Thin-section photomicrograph of siderite-cemented (dark mineral), quartz (Qz) sandstone. (B) Cement and grains viewed through an electron microprobe. (C) Close-up of the thin section and the individual siderite crystals (orange). (D) Siderite crystals (S) that fill the pore space between a quartz grain and a feldspar grain, viewed through an electron microprobe. Photographs provided by G. Romero.
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