Figure 1
From: Diamond formation from methane hydrate under the internal conditions of giant icy planets
(a) Optical micrographs of the sample before and after heating at approximately 3050 K and 19 GPa for 10 min. (b) Typical XRD patterns of the heated sample. Each XRD pattern (I to III) was obtained from each measurement point (I–III) indicated by the arrows in (a). Green circles, blue squares, and red rhombus show MH-III, ice VII, and diamond, respectively.
