14 
saloon, which may be referred the Kilkenny coal) is a 
Nat. Hist, specimen from Kongsberg in Norway, with na¬ 
tive silver. 
Case 2. The diamond , though combustible, is 
by common consent considered as the first of pre¬ 
cious stones: among the specimens selected to 
exemplify its crystalline forms, are the primitive 
regular octahedron ; the same w r ith solid angles 
truncated; with edges truncated, forming the pas¬ 
sage into the rhomboidal dodecahedron; varieties 
of the latter, giving rise to the six-sided prismatic 
and the tetrahedral forms \ cubes with truncated 
and bevilled edges; various hemitropic crystals 
or macles of diamonds, &c. With these are also 
placed specimens of the alluvial rocks in which 
the diamonds occur in the East Indies and in 
Brasil.— Zircon: to which belong the common 
jargon of various colours, and the orange-colour¬ 
ed, considered by some as the true hyacinth , 
from Auvergne, Chili, &c.; also the variety call¬ 
ed zirconite, from Friedrichsvarn in Norway, im¬ 
bedded in syenite, a rock composed of feldspar 
and hornblende .—Corundum .* which compre¬ 
hends the precious stones commonly called ori¬ 
ental gems (the sapphire, ruby, oriental amethyst, 
oriental topaz, oriental emerald), of the crystal¬ 
line forms of which the principal modifications are 
here deposited; and the common or imperfect 
corundum from Bengal, Mysore, China (the dia- 
mant-spath of Werner), Lapland, Piedmont, &c. 
—As appendix to these are added, th e Jibrolite 
(bournonite 
