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rock crystal enclosing various substances, such as saloon; 
rutile, brown iron-stone, micaceous iron, needle N A ^~7h ST . 
antimony, actinote, asbest, chlorite, &c. ; and, 
as a specimen of wrought rock crystal, a small 
antique vase is added. — Amethyst quartz of va- 
rious tints, in grouped crystals ; nodule lined 
with crystals of amethyst and cross stone or 
harrnotome, from Oberstein. To this is added 
the thick fibrous amethyst of Werner, which, 
however, is more properly to be considered as a 
subspecies of common quartz. 
(Case 5.) Common quartz : among the speci- 
mens of this widely diffused substance, which 
offers such great variety in its external aspect, 
the more remarkable are those of hacked, cor- 
roded and cellular quartz from Sehemnitz, as also 
the pseudomorphous or supposititious crystals 
principally derived from modifications of cal- 
careous and fluor spars; and, with regard to colour, 
the red quartz crystals from Compostella, imbed- 
ded in gypsum, and known by the name of hya- 
cinths of Compostella ; the blue massive quartz 
with pyrites from Norway, &c. — Among the less 
common species 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 cats eye, 
i (mostly 
