1890.] Mineralogy and Petrography. 365 
exposed to the air. They are highly magnetic, are brittle, have a 
hardness of 5.5-6, and a specific gravity of 6.977. When analyzed 
they yield Fe = 90.19; Ni = 3.08; Co=.61; C=6.70; P= .08; 
and traces of Cuand Sn—a composition corresponding to the carbide of 
iron and nickel (55 Fe. 2NiCo),C. In addition to the organic com- 
pound napalite, referred to above, two others have lately been 
described ; one by Blake ® from the Uintah Mountains in Wahsatch 
County, Utah, to which he has given the name wwurfsilife, and the 
other by Morrison ! from the old red sandstone at Craig Well, near 
Dingwall. The latter is a mineral tar, associated with a/bertite. It is 
called e/aterite. Its composition as found by Macadam is C = 81.186; 
Heig; Ou, eter, 465 N 4127; Sose 862. . Marinhte 
is a firm, black, solid substance serene jet. It is found in large, 
pure, amorphous masses a little heavier than water, and elastic in thin 
flakes. In thin pieces it is garnet red. Its hardness is 2-3, and specific 
gravity 1.03. It does not fuse in boiling water, but melts readily in 
the flame of a candle, when it burns with little smoke, It does not 
dissolve easily in any of the usual reagents——Two new minerals to 
which names have not yet been given by their discoverers have been de- 
scribed respectively by Sjögren% and Ussing*, Sjégren’s mineral 
occurs in vitreous, transparent, light green tables, associated with 
synadelphite, at the mine Ostra, in Nordmark, Sweden. The tables 
possess an easy cleavage and a pearly lustre. They are biaxial, with 
the plane of their optical axes nearly normal to the cleavage plane. 
The axial angle is small, Before the blowpipe the mineral blackens 
and fuses with difficulty. In the air it oxidizes and becomes dirty gray 
or brown. A qualitative examination shows the presence of As, Mn, 
Zn, and Fe. Ussing’s compound is found imbedded in microcline, 
and associated with aegerine and lithium mica. It forms, small, thick 
rhombohedral crystals, with æ: ¢ = 1: 2.1422. The principal forms 
present are oR, 4R, 4R, R, coo R,—2R,—} Rand œ P2. The faces 
are sometimes brilliant, and at others dull. The crystals are yellowish- 
brown and translucent. They are optically uniaxial and positive. 
Their specific gravity is 2.07, and hardness 5. In form, they resemble 
eudyalite, Their locality is Kangerdluarsuk, Greenland. 

18 Eng. and Min. Jour., December 21, 1889. 
19 Min, Mag., March, 1889, p. 133- 
20 Ofversigt af Kongl. Wetenskaps-Ak. Forh., Stockholm, 1888, p. 561. Ref. Neues 
Jahrb. f. Min., etc., 1890, 1., p. 24- 
21 Geol. Féren. Förh., X., p. 190, Stockholm. Ref. Neues. Jahrd. f. Min., etc., 1890, F, 
P. 25. 
