Oldal 40 [40]
290 MINERALOGICAL REMARKS.
in the afternoon, accompanied by a new acquaintance, who was to be
thy Cicerone, I went to Tallia; he was neither a naturalift nor a phi¬
lofopher, and got fo beaftly drunk, that.I-was obliged to get rid of
him... At Tallia I found another quarry of the white indurated clay ;
and in returning I obferved a great quantity of fragments of whitith
petrofilex, containing vegetable petrifactions or impreffions, fcattered
about on acommon. In the ftreets of Maad lay great heaps of a
breccia of petrofilex, fome of which was very pretty, and of a
greenifh caft: it is probably ufed here for building. The Baron’s
cellar is formed in the white indurated clay.
From thence F wentto Tolchva, which is only a ftage diftant. By
the road fide, near Lifka, there is a bank of fine white fand,.or a
ftone fo friable as to fall readily into fand: from the demand for it,
I fuppofe for houfehold purpofes, a great excavation has been formed.
It feels very harfh between the fingers ; under the blow-pipe-it at firft
crackles, and then {wells up to thrice its bulk, phofphorefeing and
producing a white light fcoria that fwims in water, which in a ftronger
fire is turned to-a white glafs. This is nothing but a Kind of tufa,
formed entirely of the detritus of pumice, or rather of fomething
very analogous to it; it contains fome {mall fragments of grey vol¬
eanic glafs*. In fome places it is much coarfer, being mixed with
* Tufa,
Alba heterogenia terrea inequale-granulata afperrima valde friabilis, granulis
Obfidiani.nigri & cinerei.rarius infperfis.
Tubi ferruminatorii ope crepitat intumefcens ter volumen auget, phofphorefcit,
fcoriam aque innatantem præbet, & in igne fortiori vitrum album.
an
38