146 
LONG 
GALLERY. 
from Baveno; feldspar with imbedded crystals 
and fragments of quartz, (graphic stone, graphic 
granite,) from Siberia, &c.;— Labradorfeldspar , 
(also called opalescent feldspar, being remark¬ 
able for its beautiful play of colours,) chiefly 
from the coast of Labrador and from the transi¬ 
tion 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 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 29. Feldspathic substances continued: 
—icespar and sanldine or glassy feldspar, both 
nearly allied to common feldspar; cleaveland- 
ite 9 the finest specimens of which are those from 
Dauphine and Siberia ; and pericline , united by 
some mineralogists with the preceding species, 
from St. Gothard, Tyrol, &c.;— anorthite from 
Vesuvius;— oligoclase , also called natron-spodu- 
men—together with some other species sepa¬ 
rated, perhaps unnecessarily, from common feld¬ 
spar and cleavelandite ;— leucite or amphigene, 
chiefly from Vesuvius, in separate crystals of 
various sizes and degrees of transparency, mas¬ 
sive, imbedded in pyroxenic and other lavas;— 
triphane 
