EXTRA-LIMIT AL SPECIES. 451 



EUCLASE. 



Colour white, blue and green. Crystallized. Primary a right oblique 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 30.56, 

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



Lane's mine, Connecticut, where 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 6.0 to 6.5. Sp. gr. 5.00. Infu- 

 sible before the blowpipe. Composed of peroxide of iron 66.00, oxide of zinc 17.00, red 

 oxide of manganese 16.00. 



Franklin furnace in Hamburg, New-Jersey. 



HARMATOME. 



Colour white, passing into grey, yellow, red and brown. Crystallized. 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 18.00, water 15.00. 



Bound brook, New-Jersey, in trap ? 



lOLITE. 



Colour blue inclining 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 . 69, oxide of manganese . 70, water, etc. 1 . 65. 



Haddam, Connecticut, in gneiss ; Brimfield, Mass. 



LEUCOPYRITE. ' 



Lcucopyrite. Shepard and Dana. — Axotomous Arsenical Pyrites. Jameson. 



Colour white, to steel-grey. Crystallized and massive. Primary a right rhombic prism. 

 M on M 122° 26'. Lustre metallic. Hardness 5.0 to 5.5. Sp.gr. 7.22 to 7.34. Melts 



• Shej)ard, American Jmmal of Science. XLIII. 366. 



