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378 Bituminous family Sixth Subspecies. Moor-Coal or Trapezoidal Coal. Moorkolile, Werner. Moorkolilcj Eslncr, b.iii. s . 190—La Houille limoneusc, Brock ’ ’raf vr °° rkohie ' *>. in- s. 157- Id. Ind. b. i. ^ i '~^ rTt° hle ’ SUCL 2terth ' s ' ^-Moorkoble, Ecrt. s. 346. Id. Mohs, b. ii. s. 313. Id. Leonhard, Tabel. s. 49.—Irapezoidischc Braunkohle, Karslen, Tabel. s. 58. Id. Haas. s. 116—Moorkoble, Lenz, b. ii. s. 1065. External Characters. Its colour is dark blackish-brown. It occurs massive. Internally it is glistening, and the lustre is resinous. The principal fracture is imperfect slaty; the cross fracture even, approaching to flat conchoidal. The fragments are trapezoidal, approaching to cubical. It is soft and very soft. It is rather sectile. Hie streak is shining. ^ It is uncommonly easily frangible t—the most fran gible species of coal. It is light. Chemical Characters. Nearly the same as those of brown coal. « Geognoslic Situation. It occurs in great beds in alluvial land, and floetz-trap rocks. Geographic