172 NATURAL HISTORY. [NORTH 
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 com¬ 
mon shorl;— aociniie, 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 specimens 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 im¬ 
bedded in the topaz rock, an aggregate of topaz, shorl, 
quartz, and sometimes mica ; fine Brazilian topazes, yel¬ 
low and pink, imbedded in rock crystal, &c.;—also the 
pyrophysalite from Fahlun in Sweden, and the pycnite , 
formerly considered as a variety of beryl, are referable to 
topaz ;— chondrodite (maclurite, brucite) from New Jer¬ 
sey, 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 Mont- 
blanc; 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 
spkene 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 de¬ 
nominated rayonnante en gouttiere by Saussure, on feldspar 
with chlorite, &c. ;—titanate of lime with titanate of ura¬ 
nium, &c., called pyrochlore , from Fredriksvarn in Nor¬ 
way titanates of iron , to which belong the nigrine , ise - 
vine, ilmenite , and most of the volcanic and other specular 
iron with glassy fracture;— crichtonite , brookite , polymig - 
nite, &c. 
Case 40. Columbates :— columbite or tantalite : a por¬ 
tion of the specimen from North America, in which Mr. 
Hatchett discovered the metal; variety of the same from 
Rabenstein, Bavaria, accompanied by beryl and uranite; 
