15 
the tetrahedral forms; cubes with truncated and 
bevilled edges; various hemitropic crystals or macles 
of diamonds, See. With these are also placed spe¬ 
cimens 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 co¬ 
lours, and the orange-coloured, considered by some 
as the true hyacinth, from Auvergne, Chili, &c.; 
also the variety called zirconite, from Friedrichsvarn 
in Norway imbedded in syenite, a rock composed of 
feldspar and hornblende.— Corundum: which com¬ 
prehends the precious stones commonly called ori¬ 
ental gems (the sapphire, ruby, oriental amethyst, 
oriental topaz, oriental emerald), of the crystalline 
forms of which the principal modifications are here 
exhibited; 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 fihrolite (bournonite of Lu¬ 
cas), one of the concomitant substances of com¬ 
mon corundum; and the emery which owes its 
hardness and consequent usefulness in polishing to 
an admixture of blue corundum. Between the 
common corundum of this and the feldspar of the 
contiguous opposite table-case, is placed the anda- 
fusite , which was first considered as a congener of 
the former, and afterwards referred to the latter (as 
feldspath apyre ), but appears to be distinct from 
both. 
SALOON. 
Nat. Hist* 
{Case 3.) 
