semianthracite

semianthracite

[‚sem·ē′an·thrə‚sīt]
(geology)
Coal which is between bituminous coal and anthracite in metamorphic rank, and which has a fixed-carbon content of 86-92%.
References in periodicals archive ?
Comparison of values of the activation energy (E) with those reported in the literature Reference Sample [E.sub.mean.sup.*] (E)/[kJmol.sup.-1] SC 117 M1 84 present study M2 76 M3 69 C 63.39 [10] semianthracite 67.3 Mequinenza coal 138 [12] Canizara coal 108 Rib-3 oil shale 248 Rib-7 oil shale 384 Note: * The activation energy [E.sub.mean] was calculated as arithmetic average of several E values obtained for the different conversion degrees ([alpha] [less than or equal to] 0.8, except for Sample C) shown in Table 6.
It conforms to ASTM Specification D388-84 for anthracite, meta-anthracite, and semianthracite.