8 ILLUSTRATIONS. 
Page. 
Fig. 8. Spokane Bar sapphire deposits, Lewis and Clarke County, Mont 4* 
9. Sapphire crystals from Missouri River bars, Montana 5( 
10. Map of the peridotite formation at Corundum Hill, Macon County, 
N.C 51 
11. Map of the peridotite areas in the vicinity of Sapphire, Jackson 
County, N. C, showing the location of the different corundum 
mines . . ...... . . 6' 
12. Map of the peridotite formation at Laurel Creek, Georgia . . . . .... 6< 
13. Map showing the location of the emery deposit at Chester, Mass..- 6! 
14. Cross section of the Old mine at Chester, Mass. , showing the amount 
of emery taken out to April, 1899 6! 
