16 
SALOON. 
Nat, Hist, 
mon corundum; and the emery which 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 Slidermania. Another 
substance nearly related to tliis species, is the au- 
tomolite from Fahlun in Sweden, being the spinelle 
zincifere of Haiiy.—As chemically allied to the 
substances in this table-case are added the hydrates 
of alumina, comprehending the foliated {dlaspore)^ 
and the radiated {Jiy dr argillite or luavellite) varie¬ 
ties ; to which may’be referred, as compact variety, 
the turquois, from Chorazan in Persia, where it j 
occurs in nodules like those here preserved. Be- i 
tween the common corundum of this and the' feld¬ 
spar of the contiguous opposite table-case, is placed 
the andalusite, which was first considered as a con- j 
gener of the former, and afterwards referred to the j 
latter (as feldspath apyre), but appears to be di- j 
stinct from both. - | 
{Case 3.) Among the specimens of chrysoberyl \ 
or cymophane may be noticed the North American 
variety, in its matrix of quartz and feldspar, with 
small trapezoidal garnets.— Kyanite or disthene, ' 
massive, in separate crystals and imbedded, with 
grenatite, &c. : also in small polished pieces, which 
are sometimes mistaken for sapphires.—A series of 
crystals 
