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Transmission electron microscope images (A to D) and scanning electron microscopic image (E) with energy-dispersive X-ray analysis (F) of siderite crystals formed by PV-4 with N2-CO2 as headspace gas at various temperatures. A, 4°C; B, 8°C; C, 18°C; D, 37°C; E, 28°C. Similar crystal globules were formed at all temperatures tested. Energy-dispersive X-ray analysis (F) of crystal globules (E) was used to confirm the composition of the siderite crystals.
