16 PHYSIOGRAPHY. 



Limonite Liroconite. 



is also abundant on Nantucket and Martha's Vineyard. Limonite is 

 abundant at Bennington, Monkton, Pittsford, Putney and Ripton, in Ver- 

 mont; at all of which places, it is more or less associated with ores of 

 manganese. The argillaceous varieties are common in Pennsylvania, 

 near Easton, and throughout the Lehigh range, in Fayette county at 

 Armstrong, Upper Dublin, and in Washington county. Nodular argil- 

 laceous iron, in- hollow balls from one inch to one foot in diameter, occur 

 at Bladensburg, (Maryland.) Argillaceous iron-ore exists on mount 

 Alto, in the Blue Ridge, at Hugh's mine, in Shenandoah co. (Va.) ; and 

 in Chatham and Nash counties in North Carolina. Nodular fragments, 

 which are perfectly compact and hard, occur disseminated through 

 gravel-hills, near Marietta, in Ohio. 



6. Limonite yields a considerable portion of the iron annually produced 

 in the different parts of the globe. The pig,-iron, obtained from melting 

 its purer varieties with charcoal, in particular, may be easily converted 

 into steel. The hard and compact nodular variety is much esteemed as 

 a burnisher, in the polishing of metallic buttons. 



LlNCOLNITE. 



Primary form. Right oblique angled prism. M on M = 120 

 e.g. 



Secondary form. The primary, with the acute lateral edges 

 truncated. 



Cleavage, perfect parallel with P. 



Lustre pearly on P. Color white. Transparent to translucent, 



1. On hot coals, it whitens; and before the blow-pipe, melts into a 

 spongy, white enamel. 



2. It is found in the amygdaloidal cavities of trap at Deerfield, (Mass.) 

 and upon gneiss, at Bellow's Falls, (Vt.) 



3. As the largest crystals of this substance do not exceed one tenth of 

 an inch in diameter, and as the angles given were obtained with the 

 common goniometer, it will be necessary that their correctness be con- 

 firmed by the reflective goniometer, before the evidence that they are 

 distinct from Heulandite, can be considered as completely satisfactory. 



LIROCONITE. Lirokone Malachite-Haloide. 

 Primary form. Octahedron, with a rectangular base. 

 P on P = 60 40'. M on M' = 72 22'. 



