15 
ness in polishing to an admixture of blue corun- saloon. 
dum. Between the common corundum of this Nat. Hist, 
and the feldspar of the contiguous opposite table- 
case, is placed the andalusite^ 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. 
Cases 3, 4. Among the many varieties of 
spinel we have the ceylonite or pleonaste, by some 
still considered as a distinct species, and the blue 
o 
spinel from Aker in Siidermania. Another sub¬ 
stance nearly related to this species, is the autO'^ 
molite (thespinellezincifereof Haiiy) fromFahlim 
in Sweden, and North America.—Among the 
specimens of chrysoheryl or cymophane may be 
noticed the North American variety, in its ma¬ 
trix of quartz and feldspar with small trapezoidal 
garnets.— Kyanite or disthene, massive, in sepa¬ 
rate crystals and imbedded, with grenatite, &c.; 
also in small polished pieces, which are sometimes 
mistaken for sapphires.—Emerald and beryl: 
several crystals of the South American emerald^ 
insulated and in their matrix; emeralds from 
Salzburg. Beryls of various colours, the most 
common of which is the variety called aqua¬ 
marine : the fine groups of these, found in ferru¬ 
ginous loam at Nerchinsk and Adontchelong 
in Siberia, are very remarkable ; large crystals 
of emerald or beryl from Limoges in France, 
and from Rabenstein in Bavaria, the latter ac¬ 
companied by columbium.— Near the beryl is 
placed 
