18 
SALOON. 
Nat. Hist. 
some varieties of the cat's-eye (mostly from Cey¬ 
lon) ; a substance generally referred to the 
natural order of quartz. 
Case 6 . Besides some specimens of substances 
related to common quartz, such as the cvoanturino 
quartz , the flexible sandstone from Brasil, and the 
ironflint (a substance in which oxide of iron exists 
in chemical union with silica), this case contains 
varieties of the stalagmitical quartz , also called 
quartz sinter. The most remarkable among these 
are the siliceous concretions deposited by the ce¬ 
lebrated hot spring in Iceland, the Geyser, one 
variety of which is called siliceous tufl the other 
calce donic sinter. Another variety of it is the pearl 
sinter from Santa Fiora in Tuscany (whence it 
has obtained the name of Fiorite), and from the 
island of Ischia. To this may also be referred 
the ceraunian cinter , or those enigmatical silice¬ 
ous tubes which were first found in the sands of 
the Senner heath, in the county ofLippe (where, 
from their supposed origin, they are called light¬ 
ning tubes), and subsequently, under similar cir¬ 
cumstances, at Drigg, on the coast of Cumber¬ 
land, which is the locality of the specimen here 
deposited. [See also British Coll.]—The hyalite 
is placed here, as a mineral related both to sta¬ 
lagmitical 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 re¬ 
markable are, the smalt-blue variety from Felso- 
banya 
