AET. 3. BLACK SANDS FROM IDAHO SHANISrON. 31 



14. Same locality. P 654. Abundant nionazite ; common zircon ; rare mua- 



covite, poly erase (?), samarskite (?). Average grain size 0.50 mm. 



15. Same locality. P 654. Marked " magnetite." Cliiefly magnetite, with 



rare almandite, monazite, zircon, and ilmenite. Average grain size 

 0.10 mm. 



16. Same locality. P 654. Marked " garnet." Almost wholly almandite ; rare 



columbite, ilmenite. and samarskite. Grain size averages 2 mm. 



17. Same locality. P 654. Marked " chromite." Abundant ilmenite ; common 



almandite; rare chromite (?), columbite, polycrase, zircon. Grain size 

 variable up to 2 mm. 



18. Same locality. P 654. Marked " garnet." Abundant almandite, columbite, 



samarskite ; rare limonite, zircon, monazite, polycrase. Maximum grain 

 diameter 3 mm. 



19. Same locality. P 654. Marked "monazite, through 80 on 100 mesh, 2.5 



amperes." Abundant monazite; rare biotite, zircon, ilmenite, horn- 

 blende, titanite. Grain size, average, 0.10 mm. 



20. Same locality. P 654. Marked " monazite, special, through 60 on 80 mesh, 



3.50 and 3.75 amperes." Abundant monazite ; rare zircon, muscovite, 

 biotite, and ilmenite. Grain size 0.25 mm. 



21. Same locality. P 654. Marked " olivine." Abundant samarskite, colum- 



bite; rare yttrotantalite (?), fergusonite (?), polycrase, monazite, cinna- 

 bar, chalcopyrite, zircon. Grain size, average, 2 mm. 



22. Same locality. P 654. Marked " monazite, special, through 60 on 80 mesh, 



4.00, 4.25, 4.50, 4.75, and 5.00 amperes." Abundant zircon and monazite; 

 occasional ilmenite and muscovite. Grain size, average, 0.25 mm. 



23. Same locality. P 654. Marked " monazite, special, through 60 on 80 mesh, 



2 amperes." Abundant nionazite, ilmenite, samarskite, zircon ; occasional 

 muscovite and biotite. Grain size, average, 0.25 mm. 



24. Same locality. P 654. Marked " monazite, special, through 80 on 100 mesli, 



4.50, 4.75, and 5.00 an^ieres." Abundant zircon, monazite, and quartz ; 

 common muscovite. Grain size, avei"age, 0.2 mm. 



25. Same locality. P 654. Marked " nionazite, through 80 on 100 mesh, 3.75 



amperes." Abundant monazite ; occasional zircon, quartz, and muscovite. 

 Grain size, average, 0.10 mm. 



26. Same locality. P 654. Marked " monazite, through 80 on 100 mesh, 4.00 



and 4.25 amperes." Abundant nionazite; occasional zircon; rare quartz, 

 muscovite, and ilmenite. Grain size, average, 0.10 mm. 



27. Same locality. P 654. Marked " monazite, through 60 on 80 mesh ; 3.25 



amperes." Abundant monazite ; common zircon ; rare muscovite, biotite, 

 chlorite, samarskite. 

 2S. Centerville. Cat. No. 90,480 U. S. N. M. Abundant monazite, ilmenite; 

 occasional zircon and magnetite. Average grain size 0.75 mm. 



CAMAS COUNTY. 



29. Bear Creek. Abundant magnetite, quartz; common almandite, limonite 



pseudomorphs after pyrite ; rare gold, allanite, titanite, and zircon. Aver- 

 age grain size 1 mm. 



CLEARWATER COUNTY. 



30. Cow Creek, Pierce district. Original number P 280. Abundant ilmenite, 



pyrope ; common quartz, monazite, and titanite ; rare augite and zircon. 

 Average grain size 1 mm. 



