GALLERY.1 
NATURAL HISTORY. 
167 
or cross stone, divided into baryte-harmotome and potass- 
harmotome, to which latter are to be referred the Vesuvian 
minerals called zeagoniie, gisrnondine, abrazite, and also 
the philipsite. 
The remainder of this Case is occupied by species of the 
feldspar family.— Common feldspar, variously crystallized 
and massive: among the specimens here deposited may be 
specified—the fine green variety from Siberia, called ama¬ 
zon stone; the beautiful large crystals from Baveno ; feld¬ 
spar with embedded crystals and fragments of quartz (gra¬ 
phic stone, graphic granite), from Siberia, &c.— Labra¬ 
dor feldspar (also called opalescent feldspar, being remark¬ 
able for its beautiful play of colours), chiefly from the 
coast of Labrador and from the transition syenite of Laur- 
wig in Norway ;— adularia or naber 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 cabochon, is called moon-stone; 
and a 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 com¬ 
mon feldspar ; albite, or cleavelandite, the finest specimens 
of which are those from Dauphine and Siberia, and peri - 
dine, united by some mineralogists with the preceding 
species, from St. Gothard, Tyrol, &c.;— anorthite from 
Vesuvius;— oligoclase, also called natron-spodumen—to¬ 
gether with some other species separated, perhaps unne¬ 
cessarily, from common feldspar and cleavelandite;— leu - 
cite or amphigene, chiefly from Vesuvius, in separate crys¬ 
tals of various sizes and degrees of transparency, massive, 
embedded in pyroxenic and other lavas;— triphane or spo- 
dumen and petalite: substances in which lithia, or the oxide 
of lithium, was first discovered by Arfvedson. 
Case 31. This Case contains— nepheline, from Mount 
Vesuvius, with which are now combined several varieties 
of the elceolite or fettstein of Werner ;— wernerite, under 
which name, formerly confined to some varieties of com¬ 
mon and compact scapolite, are now united the meionite of 
Vesuvius, and the greater part of the scapolite of Werner, 
