MANGANESE. 
407 
into a reddish-brown or black globule ; with borax, it forms a violet-coloured glass. When 
in powder, it is partly soluble in muriatic acid, the residuum assuming a white colour. 
Composition. Specimen from Langbanshytta — Protoxide of manganese 49.04, silica 
48.00, lime 3.12, magnesia 0.22, oxide of iron, traces ( Berzelius ). It is probably a true 
silicate of manganese. Formula MnO.Si0 3 . 
Specimen from Franklin, New-Jersey — Protoxide of manganese 66.60, silica 29.64, 
peroxide of iron 0.92, moisture 2.70, alumina a trace (Thomson). This differs much from 
the preceding. 
Geological Situation. This mineral usually occurs with magnetic iron ore in primitive 
rocks. 
LOCALITIES. 
According to Dr. Emmons, silicate of manganese has been found in this State in the coun¬ 
ties of Essex and Warren. 
This species occurs at Franklin and Sterling, New-Jersey; at the former of which, it is 
associated with magnetic iron ore, franklinite, etc.; and at the latter, with the red zinc ore, 
troostite, etc. It is also found in large rolled masses, at Cummington in Massachusetts. 
The Sesquisilicate and Bisilicate of Manganese of Thomson, credited to Franklin in New- 
Jersey, are perhaps not distinct from this species ; to which also Fowlerite, and according to 
Beudant, Torrelite should be referred. These minerals, however, differ considerably from 
the true manganese spar in the proportions of their constituents. 
BABINGTONITE. 
[In compliment to Dr. Babington.] 
Babingtonite. Levy , Phillips and ' Thomson . — Axotomer Augit-Spath. Mohs . 
Description. Colour dark greenish black. It occurs regularly crystallized. The primary 
form, according to Levy, is a doubly oblique 
prism. Fig. 481. P on M 92° 34 / ; P on T 
88° ; M on T 112° 30k But it usually crys¬ 
tallizes in eight-sided prisms. Fig. 482. g on 
m 132° 15'; h on m 137° 05'; h on t 155° 25' 
(Levy). Sometimes the faces m are wanting. 
Cleavage perfect parallel to P ; less so to t. 
Fracture imperfect conchoidal. Lustre vitreous. Thin splinters faintly translucent. Hard¬ 
ness from 5.5 to 6.0. Specific gravity from 3.40 to 3.50. Before the blowpipe alone, it 
fuses into a black enamel; with borax, it gives a transparent violet globule, which in the re¬ 
ducing flame becomes bluish green. 
Fig. 481. 
Fig. 482. 
