subbituminous

About three-fifths of U.S. coal production is bituminous, one-third subbituminous, and about one-tenth lignite (brown coal).

Energy profile of the United States 2008

The remainder, around 4,308 Mmst, consists of lignite and subbituminous coal reserves.

Energy profile of Turkey 2007

In the vicinity of Casa Rinconada the coal seams are thin, and the coal varies from lignite to subbituminous.

Tseh So, a Small House Ruin, Chaco Canyon, New Mexico : 1937

For instance, subbituminous coal may be distinguished from lignite, not by its fuel ratio alone, but by its shiny, black appearance as contrasted with the dull, woody appearance of lignite.

The Economic Aspect of Geology 1915

_ The term "bituminous," as generally understood, is applied to a group of coals having a maximum fuel ratio of about 3, and hence it is a kind of coal in which the volatile matter and the fixed carbon are nearly equal; but this criterion cannot be used without qualification, for the same statement might be made of subbituminous coal and lignite.

The Economic Aspect of Geology 1915

They are intermediate in quality and in development between peat and subbituminous coal.

The Economic Aspect of Geology 1915

United States there are great quantities of subbituminous coal of

The Economic Aspect of Geology 1915

It has greater density than the lignites or subbituminous coals, is black, more brittle, and breaks with a cubical or conchoidal fracture.

The Economic Aspect of Geology 1915

Continuation of the processes of induration produces _subbituminous coal_, or _black lignite_, which is usually black and sometimes has a fairly bright luster.

The Economic Aspect of Geology 1915

Bituminous may be distinguished from subbituminous by the manner of weathering.

The Economic Aspect of Geology 1915