26 
SALOON. 
Nat . Hist. 
rhomboidal planes. The cinnamon-stone from 
Ceylon, a scarce mineral which was supposed to 
contain zirconia, till a more accurate analysis 
proved it to be a substance nearly allied to garnet 
and vesuvian : some polished pieces of the same, 
being the true hyacinth.—Among the specimens 
of vesuvian or idocrase, the more conspicuous are 
the large beautiful crystals (the unibinaire of 
Haiiy) discovered by Laxmann on the banks of 
the Vilui in Kamschatka, imbedded in a steatitic 
rock; those from Vesuvius, where this substance 
occurs accompanied by other volcanic ejections, 
have, in Italy, obtained the trivial names of 
volcanic gems, hyacinths and chrysolites.—In 
this case are also deposited, though not very 
closely allied to the garnet tribe, the staurolite 
(called grenatite in Switzerland) ; besides several 
varieties of the cruciform and other crystals from 
Britany, we have modifications of the simple 
crystals in mica-slate from St. Gothard, accom¬ 
panied by prisms of kyanite perfectly similar to 
those of the staurolite, and sometimes longitudi¬ 
nally grown together with them. 
(Case 14.) Contains the chrysolite and olivine 
(peridot of Haiiy), the former crystallized and 
in cut and polished pieces; the latter as grains, in 
basaltic rocks and separate : among these is some 
of the olivine-like substance found in the cells of 
the 
