rock crystal enclosing various substances, such as 
rutile, brown iron-stone, micaceous iron, needle 
antimony, actinote, asbest, chlorite, &c. groups 
of rock crystal.—Amethyst quartz of various 
tints, in grouped crystals ; nodule lined with 
crystals of amethyst and cross stone or harmc- 
tome, from O'berstein. 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 Schemnitz, as also 
the pseudomorphous or supposititious crystals 
principally derived from modifications of calca¬ 
reous 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, the siderite from 
Salzburg, &c.—Among the less common species 
of quartz is the rose or milk quartz, which 
occurs only massive ; and the prase, which ap¬ 
pears to be an intimate mixture of common quartz 
and actinote.—In this case are also deposited some 
varieties of the cats eye, (mostly from Ceylon) : 
i a substance 
SALOON. 
Nat. Hist. 
