14 
SALOON, emerald) of the crystalline forms of which the 
Nat.Hist, principal modifications are here exhibited; and 
the common or imperfect corundum from Bengal, 
Mysore, China (the diamant-spath of Werner), 
Lapland, &c.—As appendix to these are added 
the fibrolite (bournonite of Lucas), one of the 
concomitant substances of common corundum ; 
and the emery, which owes its hardness and con¬ 
sequent usefulness in polishing to an admixture 
of blue corundum.—Among the many varieties 
of spinell we have the ceylonite or pleonaste, by 
some still considered as a distinct species, and 
the blue spinell from Aker in Sudermania. An¬ 
other substance nearly related to this species, is 
the automalite from Fahlun, in Sweden, or the 
spinelle zinciffere of Haiiy : in one of the larger 
crystals the metallic particles are easily distin¬ 
guished.—As chemically allied to the substances 
in this glass case is added the vvavelite or bydrar- 
gillite : the specimens of this mineral border on 
those of the prehnite (in the opposite case. No. 
11 ), to which species it was referred before its 
chemical composition was known.—Between the 
common corundum of this and the feldspar of 
the contiguous opposite glass case, is placed the 
andalusite, which was first considered as a con¬ 
vener of the former and afterwards referred to 
the 
