TITANIUM. 
431 
ILMENITE. 
[From the place where it was first found, near Lake Ilmen , in Siberia.] 
Ihnenite. Phillips arul Thomson. — Axotomes Eisen-Erz. Mohs. — Acchynitc (app. to Polymignite). Beu- 
dant ? — Mcngit. Mohs, App. 1 — Crichtonite. Shepard. 
Fig 51G. 
Description. Colour brownish or iron-black. Streak black. 
It occurs crystallized and massive. The form of the crystals 
is the same as that of specular iron. Primary a rhombohe- 
dron. Fig. 516. P on P 85° 59h Cleavage perfect parallel 
to a (see Fig. 517). Fracture conchoidal. Lustre imperfect 
metallic. Translucent. Brittle. Hardness from 5.0 to 5.7. 
Specific gravity from 4.40 to 4.80; 4.77 to 4.81 ( Thom¬ 
son ). It slightly affects the magnetic needle. Before the 
blowpipe, thin edges are rounded, but it does not fuse ; with 
fluxes, it behaves like oxide of iron. When in fine powder, 
it is soluble in hot concentrated muriatic acid. 
Composition. Specimen from the Ural mountains — Titanic acid 46.67, peroxide of iron 
11.71, protoxide of iron 35.37, protoxide of manganese 2.39, magnesia 0.60, lime 0.25, 
oxide of chromium 0.38, silica 2.80 ( Mosancler ). According to Kane, the formula is 
FeO.TiO.,. 
Geological Situation. It occurs in granite, serpentine and white limestone, and is some¬ 
times associated with rutile, and at others with magnetic iron ore. 
There is still some confusion in regard to this mineral, arising in part from the difficulty 
which attends the accurate analysis of the compounds of titanium, and in part also from the 
fact that minerals which are nearly identical in composition, having been found at different 
localities, have received different names. No positive opinion, however, can at present be 
expressed on this subject. It is believed that the Crichtonite of Shepard is identical with 
Ihnenite ; and perhaps the same is true of the Crichtonite of Count Bournon, and of some of 
the other minerals in which titanic acid is combined with the oxides of iron. 
LOCALITIES. 
The most remarkable localities of ilmcnite are in the towns of Warwick and Monroe in 
Orange county. One of these is about a mile south of the village of Amity. It occurs here 
in crystals of various sizes, sometimes an inch in diameter, imbedded in a dark coloured ser¬ 
pentine. The forms are similar to those of specular iron ore, for which this mineral was 
mistaken. It may, however, be distingushed by its colour, streak, and diminished specific 
