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. 2024 Nov 11;14:27542. doi: 10.1038/s41598-024-78352-z

Table 2.

Petrographic characteristics of the studied coal.

Supplier, country Petrographic composition
(without mineral impurities), %
Index of
reflection
vitrinite,
%
Stages of vitrinite metamorphism, %
Vt Sv I L ∑FC R 0 0.50–0.79 0.80-
0.89
0.90–1.19 1.20–1.49 1.50–1.69 1.70–2.59
EF “Pavlogradska”, Ukraine 66 0 31 3 31 0.60 99 1 0 0 0 0
EF “Dobropilska”, Ukraine 72 0 25 3 25 0.77 58 34 8 0 0 0
Wellmore, USA 77 0 20 3 20 1.02 5 11 81 3 0 0
Arch Coal Premium, USA 72 0 24 4 24 0.98 3 10 84 3 0 0
EF “Svyato-Varvarynska”, Ukraine 84 1 14 1 15 1.23 0 0 41 59 0 0
Illawarra, Australia 91 0 9 0 9 1.27 0 0 31 65 3 0