18 
SALOON. 
Nat. Hist. 
needle antimony, actinote, asbest, chlorite, &c. 
groups of rock crystal.— Amethyst quartz of va¬ 
rious tints, in grouped crystals; nodule lined with 
crystals of amethyst and cross-stone or har otome, 
from Oberstein. To this is added the thick-fibrous 
amethyst of Werner, considered by others as a sub¬ 
species of common quartz. 
(Case 5 .) Common quartz: among the specimens 
of this widely diffused substance, which offers such 
great variety in its external aspect, the more remark¬ 
able are those of hacked, corroded and cellular quartz 
from Schemnitz, as also the pseudomorphous or 
supposititious crystals, principally derived from 
modifications of calcareous and 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, and the prase, which appears to be an 
Intimate mixture of common quartz and actinote.— 
In this case are also deposited some varieties of the 
cat's-eye (mostly from Ceylon) ; a substance gene¬ 
rally referred to the natural order of quartz. 
(Case 6.) 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 
