Fig. 2: Variation of the normalized X-ray diffraction intensities of the main \(10\bar{1}0\) peak of quartz (Qtz) and of the additional diffraction peaks of the high-pressure silica phase (Ros) at the approximate interplanar spacings of 4.2 (0001), 3.7 \((10\bar{1}0)\), 2.7 \((10\bar{1}1)\), and 1.7 Å \((10\bar{1}2)\).

The plot additionally shows the normalized sum of peak intensities for the high-pressure phase and the normalized diffuse background intensities, representing the glass fraction.