15 
into the regular dodecahedron ; varieties of the lat¬ 
ter, giving rise to the six-sided prismatic and the 
tetrahedral forms; cubes with truncated and be- 
villed edges; various hemitropic crystals or macles 
of diamonds, '&c. With these are also placed spe¬ 
cimens of the alluvial rocks in which the diamonds 
occur in the East Indies and in Brasil .—Pyrorthite 
and orthite^ two newly discovered Swedish mine¬ 
rals, analysed by Berzelius, the former of which 
contains 30 per cent, of inflammable matter; both 
are allied to Gadolinite, of which a fine and scarce 
crystal is here deposited.— Tantalite from North 
America, Bavaria, and Sweden.— Zircon: to which 
belong the common jargon of various colours, and 
the orange-coloured, considered by some as the true 
hyacinth, from Auvergne, Chili^ &c.; also the va¬ 
riety called zirconite, from Friedrichsvarn in Nor¬ 
way, imbedded in syenite, a rock composed of feld¬ 
spar and hornblende.— -Corundum: which compre¬ 
hends the precious stones commonly called oriental 
gems (the sapphire, ruby, oriental amethyst, orien¬ 
tal topaz, oriental emerald), of the crystalline forms 
of which the principal modifications are here exhi¬ 
bited ; and the common ^ or imperfect corundum 
from Bengal, Mysore, China (the diamant spath of 
Werner), Lapland, Piedmont, &c.—^As appendix 
to these are added the fibroUte (bournonite of Lu¬ 
cas), one of the concomitant substances of com- 
SALOON. 
Nat. Hist. 
mon 
