166 NATURAL HISTORY. £nORTH 
hyacinths of jewellers* from Ceylon* Auvergne* Chili* the 
Lake Ilmen in Siberia; also the variety called zirconite 
from Friedricksvarn in Norway* &c. *•—the blue zircon 
from Vesuvius.— Silicate of alumina: of these we have 
the kyanite or disthene* and its varieties* the bucholzite and 
the sillimanite , and also the scarbroite * halloysite, lenzinite, 
&c.;—together with such varieties of clay as are chemical 
combinations of alumina and silica. 
For the subdivision into groups of the Silicates with 
several bases * the reader is referred to the tickets in the 
interior of the following ten Cases* which contain this ex¬ 
tensive class of mineral species. 
Case 27 contains the following zeolitic substances: 
apophyllite * or ichthyophthalmite* in line crystals* from 
Hesloe in Faroe; with stilbite *• with tessellite of Brewster* 
with poonahlite of Brooke* &c.; a variety of apophyllite* 
formerly called albine, by Werner;— chabasite or chabasie* 
in groups of primitive rhomboidal and modified crystals; 
—the variety called haidenite from Baltimore ;— mesotype 
from Auvergne* Faroe* &c.* to which are also referred the 
natrolite of Klaproth* the needle-stone of "Werner* the 
scolicite * the mesolite * krokalite * &c. ;— t/iomsonite ;—anal- 
cime * among the crystallized varieties of which are re¬ 
markably large specimens of the trapezoidal and triepointe 
modifications from Fassa in Tyrol. 
Case 28. Zeolitic substances continued; stilbite and 
heulandite ; — brewsterite -,— laumontite or lomonite* also 
called efflorescent zeolite* because some of its varieties are 
subject to decomposition by exposure to the air;— prehnite * 
the grass-green variety of which* discovered in South 
Africa by the Abbe Rochon* has been mistaken for chryso¬ 
lite* chrysoprase* and even emerald;—to this also belongs 
the koupholite of Vauquelin The substance known by 
the name of Chinese jade or you-stone, is likewise placed 
with prehnite* to which it has been referred by Count 
Bournon; but no chemical analysis has as yet been given 
of it.—A suite of specimens of comptonite from Vesuvius* 
lining the cavities of a pyroxenic lava, &c.* accompanied 
by gismondine and other crystallized substances;— gmeli - 
nite or hydrolite ; — levine * and some other new species of 
this extensive family of minerals. 
Case 29. To the same family belongs the harmotome 
