17 
merit, begin the substances belonging to the spe¬ 
cies of quartz .—Roch crystal: various modifica¬ 
tions of its crystalline forms: small dodecahedral 
and other crystals, known by the trivial names 
of Gibraltar diamonds, Bristol diamonds, &c. ; 
varieties of colour according to which the crystals 
obtain the vulgar denominations of smoky topaz 
or morion, cairngorm, citrine, &c. ; specimens 
of rock crystal, inclosing 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 har- 
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 
pseudomorphous or supposititious crystals, prin¬ 
cipally 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 
I of Compostella ; the blue quartz or siderite from 
I Salzburg.—Among the other varieties of quartz 
I is the rose or milk quartz^ which occurs only 
i massive, and the prase^ which appears to be an 
j intimate mixture of common quartz and acti- 
i note .—Fibrous quartz ,—In this table-case, are 
I c also 
I 
SALOON. 
Nat, Hist. 
