NATURAL HISTORY. 
171 
GALLERY.] 
shire, where crystals weighing upwards of fifty-nine pounds have been 
found, (the fragment of a prism in the centre of the Case weighs nearly 
forty-three pounds);—the euciase , a rare crystallized mineral substance, 
discovered by Dombey in Pern but since only found as loose crystals, at 
Capao, near Villaricca, in Brazil, and in the chlorite slate of that neigh¬ 
bourhood ;— helvine, a substance which is considered by some as a triple 
silicate of glucine, iron and manganese. In this Case are also placed the 
specimens of lazulite or lapis lazuli, (which furnishes the valuable pig¬ 
ment known by the name of ultramarine, ) massive and exhibiting planes 
of the rhomboidal dodecahedron ; the hauyne , and a few other of the 
imperfectly known silicates of alumina, soda and lime combined with sul¬ 
phates : such as the spinellane, &c. 
Case 38. In this Case are provisionally placed (besides sodalite , 
eudialyte, and pyrosmalite, substances which, being chloriferous, may 
perhaps be referred to the chlorides, Case 60), the suites of tourmaline 
and shorl, many varieties of which have been found to contain boracic 
acid. Among those here deposited are, the rubellite, also called siberite 
(tourmaline apyre of Haiiy), a specimen of which, remarkable both for 
size and form, is that in the centre of the Case : it was presented by the 
king of Ava to the late Colonel Symes, when on an embassy to that 
country, and afterwards placed by the latter in the Hon. Charles Gre- 
ville’s collection ; other red and blue varieties, chiefly from Siberia and 
from Massachusetts in North America; the flesh-coloured tourmaline, 
from Rozena in Moravia; the dark green, called Brazilian emerald; 
the asparagus-green variety in dolomite, from Campo Longo ; varieties 
of common shorl;— axinite , in most beautiful crystals, from Bourg 
d’Oisans in Dauphiny, from Norway, &c. 
Case 39. The silicates terminate in this glass Case, with the topaze 
and chondrodite, two species which, from their chemical composition, 
might be classed with the fluorides (in Case 59) :—among the speci¬ 
mens of topaz here deposited may be specified a series of crystals of 
Saxon, Brazilian, and Siberian varieties, among which there are several 
new modifications; Saxon varieties imbedded in the topaz rock, an ag¬ 
gregate of topaz, shorl, quartz, and sometimes mica ; fine Brazilian to¬ 
pazes, yellow and pink, imbedded in rock crystal, &c. ;—also the pyro - 
physalite from Fahlun in Sweden, and the pycnite, formerly considered 
as a variety of beryl, are referable to topaz ;—chondrodite (maclurite, 
brucite) from New Jersey, and from Pargas in Finland. 
The rest of this Case is occupied by oxide of titanium and titanates; 
— rutile , also called titan-shorl, massive, crystallized, and fibrous, to 
which belongs the reticulated variety with golden varnish, from Moutier 
near the Montblanc; acicular and capillary crystals of rutile in rock 
crystal, from Brazil, &c.;—the anatase , or octahedrite, from Bourg 
d’Oisans;—the silico-titanate of lime, called sphene or titanite , among 
the varieties of which are those called brown and yellow menakan-ore, 
in large crystals, from Arendal in Norway, and that from St. Gothard 
denominated rayonnante en gouttiere by Saussure, on feldspar with 
chlorite, &c. ;—titanate of lime with titanate of uranium, &c», called 
pyrochlore , from Fredriksv'arn in Norway ;— titanates of iron , to which 
belong the nigrine, iserine , ilmenite, and most of the volcanic and other 
specular iron with glassy fracture ;— criehtonite , brookite , polymig ~ 
nite , &c. 
