114 
LONG 
GALLERY. 
Nat. Hist. 
combinations of alumina and silica ; also the leelite , of 
Dr. D. Clarke, which appears to be a trisilicate of alu¬ 
mina. 
For the subdivision into groups of the Silicates with 
several bases, the reader is referred to the tickets affixed 
to the upper part of the interior of the following ten 
glass cases, which contain this extensive class of mine¬ 
ral species. 
Case 27 contains the following zeolitic substances : 
— apophyllite , or ichthyophthalme, in fine crystals from 
Hesloe in Farce, with stilbite; with tessellite of Brew¬ 
ster ; with poonahlite of Brooke, &c.; a variety of apo- 
phyllite, called albine by Werner chabasite or cha- 
basie, in groups of primitive rhomboidal and modified 
crystals;—the variety called liaidenite from Baltimore ; 
— mesotype from Auvergne, Faroe, &c., to which is also 
referred the natrolite of Klaproth, the needle stone of 
Werner, the scolicite, the mesolite , krokalite , &c.;— 
thomsonite ; — analcime , among the crystallized varieties 
of which are remarkably large specimens of the trape¬ 
zoidal 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 va¬ 
rieties are apt to decompose by exposure to the air ;— 
prehnite , the grass-green variety of which, discovered 
in South Africa by the Abbe Rochon, has been mis¬ 
taken for chrysolite, chrysoprase, and even emerald;— 
to this also belongs the koupholite of Vauquelin. The 
substance known by the name of Chinese jade or stone 
you , 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 spe¬ 
cimens of comptonite from Vesuvius, lining the cavities 
of a pyroxenic lava, &c., accompanied by gismondine 
and other crystallized substances \—gmelinite or hydro- 
lit e; — levine , and some other new species of this ex¬ 
tensive family of minerals. 
Case 29. To the same family belongs the harmo- 
tome 
