22 
saloon, of the iolite of Werner, also called dichroite 
Nat. hist, from its exhibiting two different colours when 
viewed in different positions. 
{Case 10.) This case contains zeolitic sub¬ 
stances, viz. the mesotype, among the specimens 
of which may be particularized those with per¬ 
fect prismatic acicular crystals (needle-stone of 
Werner); the delicately fibrous varieties; the red 
compact variety, by some called crocalite, &c.— 
The natrolite of Klaproth, of which a few speci¬ 
mens are added, is by some considered as a va¬ 
riety of mesotype.—Stilbite, mostly crystallized: 
among the coloured varieties is the red from 
Fassa (Fassait).—Apophyllit, some varieties of 
which have been mistaken for mesotype and stil¬ 
bite.—Analcime, among the crystallized varieties 
of which are remarkably large specimens of the 
trapezoidal modification.—Chabasite or chabasie, 
ingroups of primitive rhombohedral and modified 
crystals. 
{Case 11.) Continuation of zeolitic substances 
—Prehnite, crystallized and massive; to the 
former belongs the koupholite, to the latter may 
be referred the substance known by the name of 
Chinese white jade, of which some specimens 
are added.—Harmotome, or cross stone, both in 
simple and cruciform crystals, from Oberstein, 
Strontian, 
