1816.] during the Year 1815. 63 
Bielke at Nordmark, in the Swedish province of Wermeland, by 
Messrs. Gahn and Clason. Its colour is externally yellowish brown, 
internally light yellowish. It is crystallized in six-sided prisms, 
the principal cleavage is perpendicular to the axis of the prism; 
but there are three other cleavages parallel to the longitudinal faces 
of the prisms. Hence the primitive form of the crystal is a regular 
six-sided prism. The lustre of the faces of the crystals is splendent 
and pearly; cross fracture shining ; fracture uneven; opaque ; mo- 
derately hard; scratched by a knife, powder light green; specific 
gravity 3°081. Its constituents, according to the analysis of Hisinger, 
(Schweigger’s Journal, vol. xiii. p. 341) are as follows :— 
SIMA. 3 occ. Taldce cordite htlatelc are at OES 
Peerler ot WON. oc toe ie sy 0 ; Re oO 
Oxide of manganese........ Stace eet DA ay 
Alumina. ...... Bare Co eras Teo OO 
Muriatic acid and water. ....-..... .. 65 
BR Pa Ors ae Gai de eoreves 1:8 
100°0 
9. Nickel-Antimonial Ore.—This mineral was brought from West- 
phalia to Berlin by Count Eversmann, who gave a specimen of it 
to Professor John, to whom we are indebted for its description and 
analysis (Schweigger’s Journal, vol. xii. p. 238.) 
Its colour is leaden grey witha shade of violet. It is found 
amorphous in sparry iron stone; fracture foliated with a twofold 
cleavage; lustre splendent; that of the cross fracture shining, or 
even dull. Fragments assume a cubic form; streak, dark grey; 
brittle and easily frangible; specific gravity 5-600. John found its 
constituents as follows :— 
PRIMED noth vee 4 ce CARMA ote Se oe 
PIED 5. “a a Dinix tia w.6 4 4g a. th cagegh ers ch LT 
Puen, With RIVET. Fddoa cs oo cane oes 
Antimony with arsenic........... ee OT oe 
Trace of iron 
100°00 
10. Green Uran Mica.—Mr. Gregor has subjected the green 
uran mica of Cornwall to a chemical analysis. He found its con- 
stituents as follows. (Annals of Philosophy, vol. v. p. 281.) 
Oxide of uranium with a trace of oxide of lead 74:4 
Duida of. coppen: s 5:2 iehiu ai este sen wel nda 8°2 
SOMA dod <eiidly danas ek BOL ours 3 15:4 
WO rich Vin Wx eee Alls bes Yb Beapalow’ ao 2:0 
1000 
11. Chromate of Iron.—Some years ago Mayer announced the 
discovery of columbite or columbie acid united to oxide of iron. 
The mineral was analysed by Trommodarf, who found it a chro- 
mate of iron, and composed of 
