GALLERY.] 
NATURAL HISTORY. 
167 
or cross stone, divided into baryte-harmotome and potass- 
harmotome, to which 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 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 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 cabockon , 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 clearelandite, 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 ;— rvernerite, 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, 
