19 
in chemical union with silica), this case contains 
varieties of the stalaqmitical quartz, also called 
quartz sinter. The most remarkable among these 
are the siliceous concretions deposited by the cele¬ 
brated hot spring in Iceland, the Geyser, and which 
are distinguished into siliceous tuf, and calcedonic 
sinter. Another variety of it is the pearl sinter from 
Santa Fiora in Tuscany (whence it obtained the 
name of Fiorite), and from the island of Ischia. 
To this may also be referred the ceraunian sinter, 
or those enigmatical siliceous tubes, which were first 
found in the sands of the Senner heath, in the 
county of Lippe (where, from their supposed origin, 
they are called lightning tubes), and subsequently, 
under similar circumstances, at Drigg, on the coast 
of Cumberland, which is the locality of the speci¬ 
men here deposited. [See also British Coll.]—The 
hyalite is placed here, as a mineral related both to 
stalagmitical quartz and calcedony.—The rest of 
this table-case, and the greater part of the following, 
are occupied by calcedonic substances. Among the 
specimens of common calcedony, the most remark¬ 
able are, the smalt-blue variety from Felsobanya in 
Transylvania, crystallized in cubes; the branched 
and stalactical calcedony from Iceland, &c.; the 
botryoidal from Ferroe; nodules including water 
(enhydrites) from Monte Berico, near Vicenza, 
where they are said to occur in volcanic rocks; cut 
and polished pieces of calcedony, with black and 
c 2 red 
SALOON. 
Nat. Hist. 
