18 
saloon, suc h as ru tile 5 brown iron-stone, micaceous iron, 
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 orhar- 
motome, from Oberstein, &c. 
(Case 5.) Common quartz: among the specimens 
of this widely diffused substance, which offers such 
great variety in its external aspect, the more 
remarkable are those of hacked, corroded and 
cellular quartz from Schemnitz, as also the pseu- 
domorphous 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 Compos¬ 
tella ; the blue quartz or siderite from Salzburg. 
—Among the other varieties of quartz is the rose 
or milk quartz , which occurs only massive, and 
the prase , which appears to be an intimate mix¬ 
ture of common quartz and actinote.-— Fibrous 
quartz .—In this table-case are also deposited 
some varieties of the cafs-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 amnturino 
quartz^ th z 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 
