26 
SALOON, rhomboidai planes.—The cinnamon-stone from 
Na7. Hist, Ccyloii, a scarce mineral which was supposed to 
contain zirconia, and therefore referred to the 
hyacinth, till a more accurate analysis proved 
it to be a substance nearly allied to garnet and 
vesavian.—Among the specimens of vesuvian or 
idocrase, the more conspicuous are the large 
beautiful crystals (the unibinaire of Haiiy) dis¬ 
covered by Laxmann on the banks of the Vilui 
in Kamtschatka, imbedded in a steatitic rock ; 
those from Vesuvius, where it occurs accom¬ 
panied by other volcanic ejections, have, in Italy, 
obtained the trivial names of volcanic gems, hy¬ 
acinths and chry:olites.—In this case are also de¬ 
posited, 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 Britanny, we 
have modifications of the simple crystals in mica- 
slate from St. Gothard, accompanied by prisms 
of kyanite perfect!)^ similar to those of the stauro¬ 
lite and sometimes longitudinally 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 
