EXTRA-LIMITAL SPECIES. 451 



EUCLASE. 



Colour white, blue and green. Crystallized. Primary a right obhquc angled prism. M 

 on T 130^ 52'. Lustre vitreous and splendent. Transparent and translucent. Hardness 

 7.5. Sp. gr. 2.90 to 3.20. Very easily frangible. Before the blowpipe, it becomes opaque, 

 and then melts on the edges into a white enamel. Composed of silica 43.22, alumina 30. 5G, 

 glucina 21.78, oxide of iron 2.22, oxide of tin 0.70. 



Lane's mine, Connecticut, wlicre it has recently been found.* 



FRANKLINITE. 



Colour iron-black. In imperfect crystals or grains. Primary form a regular octahedron. 

 Lustre metallic. Acts slightly on the magnet. Hardness G.O to 6.5. Sp.gr. 5.00. Infu- 

 sible before the blowpipe. Composed of peroxide of iron (iG.OO, oxide of zinc 17.00, red 

 oxide of manganese 10.00. 



Franklin furnace iu Hamburg, New-Jersey. 



HARMATOiAIE. 



Colour white, passing into grey, yellow-, red and brown. Crvstallizcd. Primary a right 

 rectangular prism. Lustre vitreous. Transparent to translucent. Hardness 4.0 to 4.5. Sp. 

 gr. 2.40 to 2.45. Fuses before the blowpipe into a clear globule. Composed of silica 49.00, 

 alumina 16.00, baryta IS. 00, water 15.00. 



Bound brook, New-Jersey, in trap ' 



,? 



lOLITE. 



Colour blue inclinmg to black. Crystallized and massive. Primary a regular six-sided 

 prism. Lustre vitreous. Transparent or translucent. Infusible before the blowpipe, except 

 on very thin edges. Composed of silica 48.54, alumina 31 .73, magnesia 11 .30, oxide of 

 iron 5.09, oxide of manganese 0.70, water, etc. 1 .65. 



Haddam, Connecticut, iu gneiss ; Brimlleld, JIass. 



LEUCOPYRITE. 



Lcufoi)yriU'. ^:>h^■pa/■(i ami Dana. — Axotoiiious Ai^ciiifal Pyrites. Jameson. 



Colour while, to slecl-grcy. Crystallized and massive. L'riinary a right rhombic prism. 

 M on M 122'^ 2G . Lustre metalHe. Hardness 5.0 to 0.5. Sp. ur. 7.22 \o 7.;M. Melts 



* Shi'|mri.l. Americ(in Journal of Science. XLIII. 3GG. 



