Spodumene and its Alterations. 341 



Texture foliated, with the cleavages of Spodumene, but less 

 perfect. 



Hardness., 3.5. Specific Gravity, 2.623, (in coarse powder), 

 2.644, and 2.652 (in lumps). 



Lustre, dull and greasy on irregular surfaces, to weak vitreous, 

 or sometimes strongly vitreous, on the planes of 'orthodiagonal 

 cleavage of the original Spodumene. Color, greenish-gray to 

 olive-green, ranging, however, from greenish-black to greenish- 

 white, the latter along the border next the unaltered Spodu- 

 mene. Streak and powder white, slightly greenish. Opaque, 

 only slightly translucent on thin edges. Fracture uneven, as in 

 Spodumene. Feel, greasy. When breathed upon, it gives off a 

 faint argillaceous odor. 



Pyroynostics. — In the platinum forceps or on charcoal, it be- 

 comes snow-white and fuses along thin edges (fusibility 5.5), 

 without visible intumescence, to a white and translucent blebby 

 enamel. A fragment, whitened but not fused, and then moist- 

 ened with cobaltic nitrate, yields a feeble alumina reaction. In 

 matrass, it darkens to an ash-gray, in part reddish, and gives off 

 immediately, at a low red -heat, much water and a decided odor 

 of ammonia, with the usual reactions for that substance. With 

 borax and phosphorus salt, it furnishes a slight effervescence, a 

 feeble reaction for iron, and a siliceous skeleton. 



Analysis of Killinite. — The chemical composition of Killinite 

 is presented in the following analyses. 



XIV — Olive-green Killinite, from Chesterfield Hollow, Mass. 

 Analysis by myself. S. Gr.=2.623. Also, for comparison, se- 

 lected out of many discordant analyses — 



XV — Killinite from Killiuey Bay, Ireland. Analysis by 

 Lehunt & Blythe (Thomson's Min., I, 330). Different analysts 

 report S. Gr.=2.56 — 2.71, in the Killinite from this locality, 

 probably varying according to the intermixture of the unaltered 

 Spodumene. 



