19 
from Schemnitz, asalsothepseudomorphous or sup¬ 
posititious crystals, principally derived from modi¬ 
fications of calcareous and fluor spars; and, with 
regard to colour, the red quartz crystals from Com- 
postella, imbedded in gypsum, and known by the 
name of hyacinths of Compostella; ^^siderite ixom 
Salzburg; the blue quartz of Orrayervi in Finland, 
called steinheilite. —Among the varieties of quartz 
IS the rose or viilk quartz^ which occurs only mas¬ 
sive, the prase, which appears to be an intimate 
mixture of common quartz and actinote.—In this 
case are also deposited some varieties of the cafs~ 
eye (mostly from Ceylon): a substance generally 
referred to the natural order of quartz. 
(Case^^ Besides some specimens of substances 
related to common quartz, such as the avanturino 
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 cele¬ 
brated hot spring in Iceland, the Geyser, and which 
are distinguished into siliceous tufl 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 
c 2 found 
SALOON* 
Nat. Hi5t4 
