17 
decahedral and other crystals, known by the 
rivial names of Gibraltar diamonds, Bristol dia¬ 
monds, &c.; varieties of colour according to 
which the crystals obtain the familiar denomi¬ 
nations of smoky topaz or morion, cairngorm, 
citrine, &c.; specimens of 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 crys¬ 
tals ; nodule lined with crystals of amethyst and 
cross-stone or harmotome, from Oberstein, he. 
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 crys¬ 
tals, 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 bythename 
of hyacinths of Compostella ; the blue quartz or 
siderite from Salzburg.—Among the other varie¬ 
ties of quartz is the rose or milk quartz, which 
occurs only massive, and the jyrase, which ap¬ 
pears to be an intimate mixture of common 
quartz and actinote.— Fibrous quartz. —In this 
table-case are also deposited some varieties of 
the cafs eye (mostly from Ceylon) ; a substance 
generally referred to the quartz family. 
c Case 
SALOON. 
Nat. Hist. 
