saloon, rhomboidal planes. The cinnamon-stone from 
*JatTh*ist. Ceylon, 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 garuet and 
vesuvian.— 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 Kamschatka, 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 chrysolites. — 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 Britany, we 
have modifications of the simple crystals in mica- 
slate from St. Gothard, accompanied by prisms 
of kyanite perfectly similar to those of the 
staurolite and sometimes longitudinally grown 
together with them. 
(Case 14.) Contains the chrysolite and olivine 
(peridot of Haiiv), 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 
