MINERALOGY OF THE PACIFIC COAST. 



The division ia regular sectors, as indicated by Fig. 1, is 

 found among the crystals; but frequently the sectors are 

 more irregular. See Figs. 2, 3 and 4. 

 FIG 1. 



IG 2. 



FIG 3. 



Before the blowpipe the mineral becomes greenish white, 

 and is fusible on the edges with great difficulty. With 

 fluxes strong chromium reactions. 



An analysis of the massive variety which Dr. W. H. 

 Melville, of the U. S. Geological Survey, had the kindness 

 to make, gave: 



99.99^ 



