Open Access

Table 4

Peak-search report of the palm leaves, after combustion.

2-Theta d (A°) BG Height I% Area I% FWHM Crystal structure with space group Phase
21.998 4.0373 5231 521 16.4 47257 69.8 1.103 Triclinic-powder diffraction Caoxite, C2H6CaO7
22.179 4.0048 5192 646 20.4 57795 85.3 1.087 Monoclinic-(Unknown), P21 (4) C14H10 (colorless, light gray, white)
22.457 3.9558 5110 738 23.3 66256 97.8 1.091 Rhombohedral-powder diffraction, R3m Hatrurite, syn Ca3SiO5
22.623 3.9271 5084 718 22.6 60055 88.6 1.017 Triclinic-powder diffraction Caoxite, syn C2H6CaO7
37.555 2.3930 2016 2029 63.9 44222 65.3 0.265 Tetragonal-(Unknown), P41212 Formicaite Ca(HCO2)2 (light blue, white)
43.799 2.0652 1613 3174 100.0 67744 100.0 0.259 Hexagonal-powder diffraction, P63/mmc Lonsdaleite, syn (C)
77.296 1.2334 565 2070 65.2 62866 92.8 0.369 Tetragonal-powder diffraction, P41212 Cristobalite, SiO2 (colorless)

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