EXTRA-LIMITAL 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 ? 
IOLITE. 
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 0.70, water, etc. 1.65. 
IJaddam, Connecticut, in gneiss; Brimfield, Mass. 
LEUCOPYRITE. 
Leucopyrite. Shepard and Dana. — Axotomous Arsenical Pyrites. Jameson. 
Colour white, to steel-grey. Crystallized and massive. Primary a right rhombic prism. 
M on M 122° 26k Lustre metallic. Hardness 5.0 to 5.5. Sp. gr. 7.22 to 7.34. Melts 
Shepard. American Journal of Science. XLIII. 366. 
