454 DESCRIPTIVE MINERALOGY. 



RAPHILITE.* 



Colour white, with a sliade of bluisii green. In diverging acicular crystals ; the needles 

 or fibres easily separable. Lustre between glassy and silk}'. Hardness 3.5 to 4.0. Sp. 

 gr. 2.85. Before the blowpipe, becomes opaque and white, but does not melt into a globule. 

 Composed of silica 56.48, lime 14.75, alumina G.16, protoxide of iron 5.39, protoxide of 

 manganese 0.45, magnesia 5.45, potash 10.53, moisture 0.50. 



Perth, Upper Canada ; Easton, Pennsylvania ? It is perhaps only a variety of hornblende. 



RED ZINC ORE. 



Red Oxide of Zinc. Ckavdaiid. 



Colour yellowish red. Massive. Lustre adamantine. Translucent on the edges. Hard- 

 ness 4.0 to 4.5. Sp. gr. 5.43 to 5.52. Infusible before the blowpipe. Composed of oxide 

 of zinc 88.00, oxide of iron and manganese 12.00. 



Franklin and Sterling in New-Jerse3^ 



Retinalite of Thomson, is a variety of Serpentine. 



SAUSSURITE. 



Colour white or grey. Massive. Lustre pearly, inclining to vitreous. Brittle. Hardness 

 5.5. Sp. gr. 3.25 to 3.34. Melts before the blowpipe, with difficulty, into a white glass. 

 Composed of silica 49.00, alumina 24.00, lime 10.00, magnesia 3.75, oxide of iron 6.50, 

 soda 5.50. 



Canaan, Connecticut, in great abundance. 



SILLIMANITE.t 



Colour hair-brown to greyish brown. In long, slender, and often curved or bent crystals. 

 Primary a rhombic prism. Lustre vitreous, inclining to pearly. Translucent. Hardness 7.0 

 to 7.5. Sp. gr. 3.20 to 3.24. Infusible before the blowpipe. Composed of silica 38.67, 

 alumina 35,11, zirconia 18.51, oxide of iron 7.22. 



Chester, Connecticut, in slender prisms in quartz. It may be a variety of buchokite. 



SMALTINE. 



Grey Cobalt. Clcavdniid? 



Colour tin-white to steel-grey. Crystallized and massive. Primary a regular octahedron. 

 Lustre metallic. Brittle. Hardness 5.5. Specific gravity 6.47. Melts before the blow- 



•Thomsoii. Oiilliiics nf Mincralosij, 1.^-c. fBowea American Journal nf .Science, \'lll. 113. 



