CONCHOIDAL GLANCE-COAL. 391 Internally it is shining, verging on splendent, and the lustre is metallic. The fracture is large and small conchoidal; yet we can occasionally observe a trace of the ligneous texture. The fragments are indeterminate and angular, sharp- edged. It is soft, sometimes bordering on semi-hard. It is rather brittle. It is easily frangible. It is light. In thin pieces it emits a ringing sound. Chemical Characters. It burns without flame or smell, and leaves a white- coloured ash. Geognnstic Situation. It occurs in beds in the oldest flcetz coal formation, and along with floetz-trap rocks. It occurs in beds in the coal formation of Ayrshire, as near Cumnock and Kilmarnock; in the coal districts in the river district of the Forth ; and in Staffordshire in England. On the Continent, it is met with in the Meiss- ner in Hessia. Constituent Parts. Inflammable Matter, Alumina, j. Siliea and Iron, 96.66 2.00 1.33 Schraub. Beschr. d. Meissner, s. 146. Geographic Situation. B b 4 Observations,