14 



ist. Sub-division. — (Table 15.) — Sp. gr. never below 4.0. 



2d. Sub-division. — (Table 16.) — Sp. gr. never above 5.0 



Second Division. — Lustre not metallic, (including semi or im- 

 perfect metallic.) Tables from 



1st. Sub-division. — (Table 17 and 18.) — Always scratched by 

 quartz, often scratched by felspar, sometimes by apatite, never 

 scratched by calc. spar. 



Isti Section. — Sp. gr. never below 3.5. 



2d. Section. — Sp. gr. never above 4.0. 



2d. Sub-division. — (Tables 19 and 20.) — Always scratched by 

 fluor, often scratched by calc. spar, sometimes scratched by gyp- 

 sum. 



Is^ Section. — Sp. gr. never below 5.0. 



2d. Section. — Sp. gr. never above 4.0. 



THIRD GRAND DIVISION. 



First Division. — Magnetic either before or after roasting on 

 charcoal. Tables from 



First Sub-division. — Lustre metallic, (including semi or imper- 

 fect metallic.) 



1st. Section. — (Table 21 .) — Always scratched by quartz, often 

 scratched by felspar, sometimes scratched by apatite, never 

 scratched by fluor. 



2d. Section. — (Table 22.) — Always scratched by apatite, often 

 scratched by fluor, sometimes scratched by calc. spar, rarely 

 scratched by gypsum. 



Second Sub-division. — Lustre not metallic, (including semi or 

 imperfect metallic.) 



1st. Section. — (Table 23.) — Always scratched by quartz, often 

 scratched by felspar, sometimes scratched by apatite, never 

 scratched by fluor. 



2d. Section. — (Table 24.) — Always scratched by apatite, often 

 scratched by fluor, sometimes scratched by calc. spar, rarely 

 scratched by gypsum. 



3d. Section. — (Table 25.) — Always scratched by calc. spar, 

 often scratched by gypsum. 



Second Division. — Not magnetic, either before or after roast- 

 ing on charcoal. Tables from 



