INDEX 





Nailhead >|.:ii . 379. 

 Nalitokit. . HI I 



ite, 1.1^ 



Native element -. '.'>! 



181 873. 



Natron, -IMI 



Natropliilit' 

 Naumannite, (i:.'". 

 \egaii\c birefringence, 169. 



tals, !>::>. 170. 

 forms, 27, 79. 

 Nemalite, 362. 

 Neod\ -iiium, .~i7_'. 

 Neplieline, 440, (101, 675. 

 Neplielitc, inn, 440, (i()4, 611, 675. 

 Nept unite, 505. ti:W. (KiCi, 6 

 Nes'iuchonite. fiiil . 

 Niccolite, 309, 0<K), C.-JL'. 



Nickel, tests, 574. 

 Nicols prism. 179. 

 Niobium (culti;iil)iuin), 570. 

 \it.-r. .V.M, i iiii i, 039. 

 Nitrates, 507. 

 tots, 590. 

 Nitric acid. 560. 

 Nitroharitr, tUO. 

 Nitrocalcitc, 521. 

 Nodular, 269. 

 Non-metallic luster, 274. 

 Norden.skiolilino, 646. 

 Normal, J t .i. 



salt. -m. 



N'Mi-thupitc, 661. 

 Nosean, 438. 

 Nosdito, 4S8, 674. 

 Nugget, 269. 



O 



niitusr liiscctrix, 173. 

 Ocl.cr, 365. 

 Ochrolitc, 647. 

 Octahcdrito, 351, 668. 

 Octahedron, 62. 



hex-, 49. 



tetragonal tris-, ~>0. 



trigonal tris-, 50. 

 Oldhaiuit.-. life'. 

 ( )ligocl:i.sc, 415. 



Olivenite, 513, 643 

 Olivine, 44. ii(-), 614, 680. 

 Odorw, .">."'-. ~>~>~ . 

 Okenite, 671, 673. 

 Onyx. 360. 

 Oolitic. 271. 



Opal, 39, 604, 609, 680. 

 Opaque, 275. 

 Open tubes, 558. 

 Optic axes, 172, 198. 

 axial angle, 173. 



measurement of, 205. 



)ptical 



orientation 



/''", 174. 175. 

 .-iicn, 

 rdmai 



anic- coinpoiind-. .Vi| . 

 >rient:il anietli\.-,t, 342. 

 emerald, 342. 

 topaz, 342. 



>ni/m of min> nils, 297. 

 OrlofT diamond, 282. 

 ( )rocliloritc, 497. 

 On .f rite, (i-_'7. 



piment, 295, 606, 640. 

 )rtlioa\i>. / .'ii. 



Orthocla.se. //.v, 404, 604, 613, 675. 

 ortliodoine, 123. 

 Ortliopiiiacoid, 123. 

 Ortliopri.sm, 123. 



< >rtliop\ ramnl>. 1 ! !. 



< trthoilioinliic sy.>tein, 17, IIS. 

 Orthosalts, 233. 

 Ortliosilicati's, 233, 4S8. 

 Orthosilicic acid, 233. 



( >rtliorluiinl)ic amphiholes, 431. 



axial ratio, 120. 



crystals. //.;. 



dispereion, 207. 



hemihedral, 118. 



liemipyramiils, 117. 



holoaxial, 118. 



holohedral. 113. 



liolos\-inmetric, 113. 



prisms, / i.l. 



pryoxene, 419. 



Oscillatory combinations, 757. 

 ( )sinium, te>ts, ."isj. 

 Ottrelite, 497. 

 Oxidation, 251. 

 Oxides, 233, 337. 

 Oxidizing flame, 549. 



Paclmolite, 334, 663. 

 Palladium, fi.'i'J. 



tests, 582. 

 Pandermite, 525. 



Paragniiite, ()?'_'. 

 Parallel-faced hcmihedrons, 86. 

 Parallel gruwths. 

 Paramelaconite. (i:;i . 

 Parameters, 17, 156. 



topic, 228. 



Parametral face, 5. 

 PariMte, 661. 



Parting, 257. 

 Partscliinite. 666. 



I'earceiti'. '''_'!). 



Pearly luster, 279 



