Fig. 6: Pressure-density diagram displaying Hugoniot12,42, 43 and X-ray diffraction data19 derived from shock experiments on quartz in comparison to density data of hydrostatic diamond anvil cell (DAC) experiments55, 56 and to our rapid compressed samples, which represent a mixture of quartz (Qtz) and the metastable rosiaite-structured (Ros) high-pressure phase during compression.
The densities of the individual phases have been inferred from measured lattice parameters and the proportions of the two phases were derived from Fig. 2.
