60 
NATURAL HISTORT. 
[NORTH 
colour to oxide of chromium : the most remarkable specimens of 
emerald are those from Santa Fe, from the Ural, from Heubachthal 
in Bavaria, and from Mount Zahara in Egypt;—among those of the 
beryl or aquamarine, may be specified the fine blue and yellow varieties 
from Mursinsk in the Ural, the colourless limpid crystals, and those half 
blue and transparent, half white and opaque, from Odontchelong near 
Nerchinsk;—the bluish and greenish opaque beryls from Acworth in 
New 7 Hampshire, where massy crystals have been found (the two im¬ 
perfect prisms placed on the shelf near this Table Case weigh, the one 
eighty-three, the other nearly forty-three pounds);—the euclase , a 
rare mineral, discovered by Dombey in Peru, but since only found 
as loose crystals, at Capao, near Villaricca, in Brazil, and in the chlo¬ 
rite slate of that territory;—the plienacite or phenakite of Norden- 
skiold, (which, if really a bisilicate of glucine, should be referred to the 
silicates with one base in Table 26) occurs, together with emerald in 
the Ural, and in brown iron-stone at Framont in Alsace;—the helvine 
from Schwarzenberg, considered as a triple silicate of glucina, iron 
and manganese_Silicates containing yttria and protoxide of cerium; 
to these belong the gadolinite. the allanite or cerine, the orthite and 
pyrortkite, as likewise the tsliefkinite of Rose *. The rest of this Table 
Case is occupied by the oxide of titanium and the titanates, to the former 
of which belong—the rutile , also called titan-shorl, massive and crystal¬ 
lized, the reticulated variety, generally with golden tarnish, from Mou- 
tier, near the Mont Blanc;—the capillary rutile in rock crystal from Bra¬ 
zil, in beryl from the East Indies, &c.;—the anatase (oisanite or octa- 
hedrite), which occurs only crystallized, chiefly at Bourg d’Oisans, in 
Dauphinv. Among the titanates the more remarkable are—the silico- 
titanate of lime, called sphene or titanite, and, among these, the varieties 
formerly designated by the name of browrn and yellow menakanite, in 
large crystals, from Arendal in Norway; the variety from St. Gothard, 
called rayonnante en gouttiere by Saussure, on feldspar with chlorite, &c.; 
_the pyr ochlor e, a titanate of lime, with titanate of protoxide of uranium, 
&c., from Fredriesvarn in Norway;—the polymignite , foundpn the zir¬ 
con-syenite of the same locality, and composed chiefly of the titanates of 
zirconia and yttria; also the ceschynite from the lake Ilmen near Miask, 
being a titanate of zirconia and oxide of cerium ;—the cerstedtite, a tita¬ 
nate" of zirconia with lime, magnesia and protoxide of iron, from Aren¬ 
dal ;_the mosandrite , from the same locality, being a silico-titanate of 
lantane, manganese, &e,; and lastly the titanates of protoxide of iron, 
variously combined with the oxide of that metal, in many of those va¬ 
rieties of volcanic and other specular iron which exhibit a glassy frac¬ 
ture, as likewise in the minerals known by the names of axotomous 
iron or kibdelophane, crightonite , menacunite , nigrine, iserine, ilme- 
nite , &c. 
Case 38. In this Table Case (besides the silicates containing 
yttria and protoxide of cerium, mentioned in the description of Case 
37) are placed the following orders of minerals. 
Combinations of columbic or tantalic acid with protoxides of iron, 
manganese, lime, yttria, &c.: among the specimens of the columbates 
or tantalates here deposited may be specified that of the tantalite (co- 
lumbite) sent by Gov. Winthrop to Sir Hans Sloane, in which Mr. 
* These are removed to the next Table Case. 
