PHYSIOGRAPHY. 



Galena Garnet. 



221 



ington, a deposit has lately been discovered at Brookfield, whose ex- 

 tent is not yet fully developed. In Massachusetts, numerous veins have 

 been discovered in Hampshire county, the most important of which ex- 

 ist at Southampton and Northampton. In addition to the foregoing, it 

 may be added that Galena has been found in Vermont and Maine. 



Galena is the source of the principal part of the lead of commerce. 

 On account of its generally containing a small quantity of silver, it is also 

 employed to a considerable extent for the extraction of this metal. Pot- 

 ters use either the Galena reduced to powder, or the litharge produced 

 from it, for glazing coarse pottery. 



GANOMATITE. 



Massive : in crusts, and kidney-shaped. Fracture conchoidal. 

 Lustre vitreous. Color yellow, to brown and green. 

 Sp. gr. =2926. 

 Other properties and locality, unknown. 



GARNET. Dodecahedral Garnet. MOHS. 

 Primary form. Rhombic dodecahedron. 

 Secondary forms. 



1. Dodecahedron, with the edges truncated. Hamburg, 

 (N.J.) 



2. Trapezohedron. Washington, (Conn.) Common. 



3. Dodecahedron, with the edges replaced by three 

 planes, (trie margine. HAUY.) 



Fig, 210, 



Franconia, (N. If.) 



19* 



