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 ?
It conforms to ASTM Specification D388-84 for anthracite, meta-anthracite, and semianthracite.