56 
NATURAL HISTORY. 
[north 
called kaidenite 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. ;— thomsonite; — anal- 
cime, among the crystallized varieties of which are remarkably large 
specimens of the trapezoidal and triepointe modifications from Fassa 
in Tyrol;— stilbite and heidandite •— brewsterite ;— laumontite or lomo- 
nite, also called efflorescent zeolite, because most of its varieties are sub¬ 
ject 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 chrysolite, 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 pyroxenie lava, &c. accompanied by 
gismondine and other crystallized substances ;— gmelinite or hydrolite j 
— levine , and some other new species of this extensive family of minerals. 
Case 29. To the same order belongs the harmotome or cross stone, 
divided into baryte-harmotome and potass-harmotome, to wfflich latter 
are to be referred the Vesuvian minerals called zeagonite , gismondine , 
abrazite, and also the philipsite. 
The remainder of this Case is occupied by species of feldspathic sub¬ 
stances.— Commonfeldspar, variously crystallized and massive i among the 
specimens here deposited may be particularized—the fine green variety 
from Siberia, called amazon stone ; the beautiful large crystals from 
Baveno; feldspar with embedded crystals and fragments of quartz (gra¬ 
phic stone, graphic granite), from Siberia, &c.;— Labrador feldspar 
(also called opalescent feldspar, being remarkable for its beautiful play 
of colours), chiefly from the coast of Labrador and from the transition 
syenite of Laurwig in Norway ;— adularia or naker feldspar , principally 
found on mount St. Gothard, but not in the valley of Adula from which 
its name is derived: the fine variety from Ceylon, when cut en ca- 
bochon, is called moon-stone; anda yellow naker feldspar with reddish dots 
has obtained the name of sun-stone, which is also sometimes given to the 
beautiful avanturino variety of common feldspar placed in this glass-case. 
Case 30. Feldspathic substances continued — ice-spar and sanidine 
or glassy feldspar, both nearly allied to common feldspar; albite or 
cleavelandite , the finest specimens of which are those from Dauphine 
and Siberia ; and pericline , united by some mineralogists with the pre¬ 
ceding species, from St. Gothard, Tyrol, &c. ;— anorthite from Vesu¬ 
vius ;— oliglocase, also called natron-spodumen—together with some 
other species separated, perhaps unnecessarily, from common feldspar 
and cleavelandite;— leucite or amphigene, chiefly from Vesuvius, in 
separate crystals of various sizes and degrees of transparency, massive, 
embedded in pyroxenie and other lavas ;—triphane or spodumen and 
petalite: substances in which lithia, or the oxide of lithium, was first dis¬ 
covered by Arfvedson. 
Case 31. This Case contains— nepheline, from Mount Vesuvius, 
with wfflich are now combined several varieties of the elceolite or fettstein 
of Werner ;—wernerife, under wfflich name, formerly confined to some 
varieties of common and compact scapolite, are now united the meioniie 
