19 
fluor spars ; and, with regard to colour, the red 
quartz crystals from Compostella, imbedded in 
gypsum, and known by the name of hyacinths of 
Compostella; the siderite from Salzburg ; the blue 
quartz of Orrayervi in Finland, called steinheilite .— 
Among the varieties of quartz is the rose or milk 
quartz , which occurs only massive ; the prase, 
which appears to be an intimate mixture of com¬ 
mon quartz and actinote.—In this case are also 
deposited some varieties of the cafs-cye (mostly 
from Ceylon) : a substance generally referred to 
the natural order of quartz. 
(Case 6.) Besides some specimens of substan¬ 
ces related to common quartz, such as the avantu- 
rino quartz , the flexible sandstone from Brasil, 
and the iron-flint (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 celebrated hot spring in Iceland, the Geyser, 
and which are distinguished into siliceous tuf y 
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 enigma¬ 
tical siliceous tubes, which were first found in the 
sands of the Senner heath, in the comity of Lippe, 
(where, from their supposed origin, they are called 
d 2 lightning 
SALOON 
Nat. Hist 
