Page:Transactions of the Geological Society, 1st series, vol. 1.djvu/377



I have seen specimens of bardiglione, in small bluish laminæ, including pretty considerable masses of sulphur; but I was unable to learn whence they were obtained.

This variety has considerable resemblance in its texture and external aspect to the granular magnesia carbonate of lime; but in its lustre it approaches nearest to the lamellar variety of that substance.

This variety presents itself in a mamillary, and frequently contorted form, resembling the convolutions of the intestines, whence it was called Pierre de Tripe, by which name alone it was known for some time. Its texture is compact, approaching more or less to lamellar.

This variety of bardiglione appears hitherto to have come exclusively from the salt-mines of Wieliczka, though it is also said to have been met with in those near Bochnia, in Poland. It was at first very improperly considered as a sulphate of barytes, which very probably may have been the cause of a variety of the latter substance, which sometimes approaches to a stalactical figure, having been confounded with it; hence it has been said by some mineralogists to have been found also in Saxony, and in Derbyshire, from which places I have never seen any thing that could be referred to it.

According to Klaproth this substance is mixed with a small proportion of sea-salt; his analysis gives 42 parts of lime, 56.5 of sulphuric acid, and 0.25 of sea-salt, leaving a loss of 1.25.