Figure 6. Powder X-ray diffraction analysis of mineral particles derived from surface waters.

Seawater, hot spring water and soil water was filtered through 0.22-μm pore membranes prior to incubation at room temperature for one week. Particles found in one-week old samples were centrifuged at 120000 g for 2 hrs at 4 °C and the resulting pellets were prepared for X-ray diffraction analysis as described in Methods.