58 
n at u r al hist or y. ( Minerals.) 
[north 
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 ce¬ 
rium*; to these belong the gadolinite, the allanite or cerine , the orthite 
and pyrorthite , as likewise the tshefkinite 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 
Brazil, in beryl from the East Indies, &c.;—the anatase (oisanite or 
octahedrite), which occurs only crystallized, chiefly at Bourg d’Oisans, 
in Dauphiny. Among the titanates the more remarkable are—the silico- 
titanare of lime, called sphene (titanite of Klaproth), and its varieties 
formerly designated by the names of brown and yellow menakanite, in 
large crystals, from Arenaal in Norway; the variety from St. Gothard, 
called rayonnante en gouttiere by Saussure, on feldspar with 
chlorite, &c. ;—the greenovite (sphene coloured by manganese), from 
St. Marcel, Piedmont;—the perowskite ;—the polymignite, found in 
the zircon-syenite of Fredricsvarn in Norway, and composed chiefly 
of the titanates of zirconia and yttria; also the eeschynile from the 
lake Ilmen near Miask,being atitanate of zirconia and oxide of cerium; 
—the oerstedtite, at-itanate of zirconia with lime, magnesia and protoxide 
of iron, from Arendal;—the mosandrite , from the same locality, being 
a silico-titanate of Iantane, manganese, &c. ; the yttrotitanite or keiU 
hauite ;—and lastly the iron titanites, variously combined with the prot¬ 
oxide of that metal, in many of those varieties of volcanic and other 
specular iron which exhibit a perfect conchoidal fracture, as likewise in 
the minerals known by the names of axotomous iron or kibdelophane, 
crightonite , menacanite , nigrine, iserine, ilmenite , &e. 
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, zirconia, &c.: among the columbates or tan- 
talates here deposited, may be pointed out the specimen of tantalite 
( columbite ) sent by Gov. Winthrop, from North America, to Sir Hans 
Sloane, in which Mr. Hatchett, in 1801, discovered the metal denomi¬ 
nated by him columbium, but which, eight or nine years later, was sup¬ 
posed by Dr. Wollaston to be identical with the metal found nearly 
about the same time, by Eckeberg, who had called it tantalum: a 
name that had become familiar to continental chemists and mineralo¬ 
gists, and was therefore retained by them;—the same from Raben- 
stein in Bavaria, accompanied by crystallized beryl and uranite f; 
—the Finbo- and the Brodbo-tantalites of Berzelius;—the yttro - 
tantalite , from Ytterby, the uranotantalite of G. Rose, from Miask, 
Siberia;—the microlite of Shepard, the wohlerite of Scheerer, and 
some other new mineral substances related to them, but which all 
stand in need of ulterior chemical examination. 
* These are at present placed in the next Table Case. 
f Since H. Rose’s discovery of the niobic (.which had been taken for tantalic) 
acid, the name of columbite has been restored to the above American and Bavarian 
minerals. 
