Lignite coal, Fayette County, Texas
Lignite aka brown coal, is a soft brown combustible sedimentary rock formed from naturally compressed peat. It is considered the lowest rank of coal due to its relatively low heat content.
Location: Shaft mines operated south of Ledbetter in north Fayette County from 1905 to 1908 where two beds of lignite, 7 and 8 feet thick, were mined at depths of 55 and 95 feet.
Specimen size: 4 x 3 x 1.5 inches
Specimen weight: 113 grams
Collection reference: TMM 2502
Additional Information: Lignites in the Manning Formation of Fayette County generally are poorer inquality than lignites of the Wilcox Group. Especially notable is the relatively high content of ash in the Fayette County lignites. The following analysis of gas distillate from Fayette County lignite is recorded by Phillips and Worrell (1913, p. 202):
Gas yield, cv. ft. /dry ton = 6,435
Illuminants, %. = 2.2
Carbon monoxide, % = 21.9
Hydrogen, %. = 44.2
Methane, % = 19.7
Nitrogen, % = 10.8
Specific gravity = .492
Candle power = -1.
B.t.u. /cu. ft. (calc.) = 458
Information from "Lignites of the Texas Gulf Coastal Plain" by William L. Fisher, University of Texas, BEG ROI #50, October, 1963.