16 
SALOON. 
Nat. Hist. 
owes its hardness and consequent usefulness in 
polishing to an admixture of blue corundum.— 
Among the many varieties of spinel we have the 
ceylonite or pleonaste, by some still considered 
as a distinct species, and the blue spinel from 
Aker in Siidermania. Another substance nearly 
related to this species, is the automolite from 
Fahlun, in Sweden, being the spinelle zincifere of 
Haiiy.—As chemically allied to the substances 
in this glass ease are added the hydrates of alu- 
mine, comprehending the foliated ( diaspore ), and 
the radiated (hy dr argillite or voavellite) ; to which 
may be referred, as compact variety, the turquois 
from Chorazan in Persia where it occurs in nodules 
like the one here preserved. Between the common 
corundum of this and the feldspar of the conti¬ 
guous opposite glass 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. 
(Case 3.) Among the specimens of chrysobe - 
ryl or cymophane may be noticed the North Ame¬ 
rican variety, in its matrix of quartz and feldspar* 
with small trapezoidal garnets.— Kyanite or dis- 
thene, massive, in separate crystals, and imbed¬ 
ded, with grenatite, &c.: also in smallpriished 
pieces, which are sometimes mistaken for sap¬ 
phires.—A series of crystals of Brasilian, Saxon, 
and Siberian topazes , among which there are 
some new modifications ) Saxon varieties, imbed¬ 
ded 
