214 PHYSIOGRAPHY. 



Fluor Franklinite. 



in a crystalline Quartz in the notch of the White Mountains in New 

 Hampshire. Fluor (variety Clorophane) of several colors accompanies 

 the Topaz and Magnetic Iron- Pyrites, at Trumbull, (Conn.) where 

 it also forms entire veins in gneiss. An emerald green, massive vari- 

 ety occurs in narrow seams in mica slate, at Putney in Vermont. Other 

 American localities are the following : Smith co. (Tennessee) in white 

 and purple cubes; in Virginia, near Woodstock, Shenandoah co., in 

 small loose masses, in the fissures of a limestone rock containing shells ; 

 also at Shepherdstown on the Potomac, in veins of white limestone, of 

 red and purple colors ; in New Jersey, near Franklin furnace ; in New 

 Yorkj at Amity, in thin seams in white limestone, along with yellow 

 Tourmaline, Hornblende and Spinel ; and at Lockport and its vicinity, 

 in white cubes, in black limestone, associated with crystallized Calca- 

 reous Spar and Celestine ; in Massachusetts, at the Southampton lead- 

 mine. 



FoRSTERITE. 



Primary form. Right rhombic prism ? M on M = 128 54', 



Secondary form. The primary, having its terminal, and its 

 acute lateral, edges replaced by single planes: the inclination 

 of the faces on the terminal edges to the base = 126 6'. 



Cleavage, parallel with P. 



Color white. Translucent. 



1. It is inferred from the experiments of CHILDREN, to be a silicate 

 of magnesia. 



2. It is found with Spinel and Pyroxene on Mount Vesuvius. 



FRANKLINITE. Dodecahedral Iron-Ore. 

 MOHS. 



Primary form. Regular octahedron. 



Secondary form. Regular octahedron, with its edges 

 truncated. Irregular forms, grains. 



Cleavage parallel with the primary form, but not perfect. 

 Fracture conchoidal. Surface of all the faces smooth. 



Lustre metallic. Color iron-black. Streak dark brown. 

 Opake. 



