16 
SALOON. 
Nat. Hist. 
mon corundum; and the emery which owes its 
hardness and consequent usefulness in polishing to 
an admixture of blue corundum.—Amongthe many 
varieties of spinel'we have the ceylonite or pleonaste, 
by some still considered as a distinct species, and 
O 
the blue spinel from Aker in Siidermania. Another 
substance nearly related to this species, is the au- 
tomolite from Fahlun in Sweden, being the spinelle 
zincif^re of Haiiy.—As chemically allied to the 
substances in this table-case are added the hydrates 
of alumine, comprehending the foliated {diaspore')^ 
and the radiated (hy dr argillite or luavellite) varie¬ 
ties ; to which may be referred, as compact variety, 
the turquois, from Chorazan in Persia, where it 
occurs in nodules like those here preserved. Be¬ 
tween the common corundum of this and the feld¬ 
spar of the contiguous opposite table-case, is placed 
the andalusite^vA\\Qh was first considered as a con¬ 
gener of the former, and afterwards referred to the 
latter (as feldspatli apyre), but appears to be di¬ 
stinct from both. 
{Case 3.) Among the specimens of chysoheryl 
or cymophane may be noticed the North American 
variety, in its matrix of quartz and feldspar, with 
small trapezoidal garnets.— Kyanite or disth^ne, 
massive, in separate crystals and imbedded, with 
grenatite, &c.: also in small polished pieces, which 
are sometimes mistaken for sapphires.—A series of 
crystals 
