Oldal 50 [50]
OCR
300 MINERALOGICAL, REMARKS the town are zeolite rocks like thofe near Tokay. In one place, where it is of a more earthy appearance, it is very cellular, and the cells ‘are uncommonly deep and clofe together, quite like.a honey-comb. ‘The blow-pipe thewed it, however it differed in appearance, to-be of the fame nature. A little further from the town, I. found a. bank of very fine white ftone; like that near Lifka, but ftill finer; were -it not for its harfh feel, it might be taken for chalk, it is fo very fines the blow-pipe fhows its nature at once, it intumefces greatly.—— Further on, in a deep ravine, I met with. a rock as curious as any. I had hitherto feen. It was a breccia of fragments of an imperfe@ kind of pumice, in which the filky appearance of this foffil was. very evident; though it had but little of its fibrous texture: this forms the greateft part: this is mixed with a much fmaller quantity of the grey gläfly pitch-ftone : thefe two by degrees pafs into one another. Thefe fragments, which are from a quarter of an inch to a-pin’s head in bulk, feem to be cemented by a very thin. glafly coating, but fil of the fame nature. In fome of the beds, where all the parts are fmaller, it looks juft like a fand ftone ; and I found.a thin: bed ‘about half an inch thick, which might eafily be taken for granulated quartz’: this gives fire freely with a fteel. Here again, however heterogeneous the components of this foffil may appear to the eye, they are not fo in their nature; they all greatly intumefce under the blow-pipe, and form a white fcoria. Befides thefe rocks, I found fome loofe blocks of the afh-coloured glaffy pitch-ftone pafling into pumice; in fome parts, particularly if broken in a certain direction, ithas nothing 3 of 48
