696 



INDEX 



Rhombohedron, 90. 

 Richardite, 626. 

 Richtorite, 667. 

 Riebeckite, 435, 659. 

 Right-handed crystals, 27, 197. 

 Rinkite, 667. 

 Ripidolite, 497. 

 Roasting, 552. 

 Rock crystal, 358. 

 Rock salt, 327. 

 Rock sections, 216. 

 Roeblingite, 647. 

 Romerite, 540, 636. 

 Rocpperite, 451. 

 Rontgen ray, 280. 

 Rosccelite, 490, 670. 

 Rotation twins, 137. 

 Rotatory polarization, 196. 

 Rubellitc, 475. 

 Rubidium, tests, 564. 

 Ruby, 342. 



silver, 322, 323. 



spinel, 371. 

 Ruthenium, 582. 

 Rutilc, 349, 597, 598, 605, 612, 634, 668. 



Safflorite, 315, 621. 

 Sagenito, 350. 

 Salt, 240. 

 Saltpeter, 521. 

 Salts, 224. 



acid, 226. 



basic, 226. 



hydrated, 227. 



normal, 226. 

 Samarium, 572. 

 Sand, black, 288. 



green, 



Sandstone, 356. 

 Sanidine, 408. 

 Sapphire, 342. 

 Sarcolite, 675. 

 Sartorite, 320, 622. 

 Sassolite, 523, 640. 

 Satin spar, 537. 

 Scale of colors, 184. 



of fusibility, 555. 



of hardness, 260. 

 Scalenohedron, 90. 



tetragonal, 60, 70. 

 Scandium, 572. 

 Scapolite, 453, 612. 

 Schapbachite, 628. 

 Scheelite, 543, 603, 668. 

 Schefferite, 424, 666. 

 Schiller, 422. 

 Schirmerite, 628. 

 Schorl, 474. 

 Schorlomite, 444, 667. 



Schwartzenbergite, 648. 



Schwartzite, 325. 



Scleromater, 259. 



Scolecite, 479, 673. 



Scorodite, 652. 



Second order of colors, 184- 



Secondary enrichment, 253. 



Secondary minerals, 244. 



Secondary optic axes, 172. 



Sectility, 258. 



Selenite, 537. 



Selenium, *l^ 587. 



Sellaite, 677. 



Senaite, 627. 



Sc'iiarmontite, 346, 640. 



Sensitive plate, 199. 



Sepiolite, 501, 601, 678. 



Scricitc, 491. 



Serpentine, 498, 601, 614, 678. 



Sesquioxides, 341. 



Siderite, 91, 388, 602, 606, 657. 



Sideronatrite, 635. 



Sign of birefringence, 169, 173. 



Silicates, 233, 403. 



classification of, 233. 

 Silicic acids, 233. 



salts of, 233. 

 Silicon, tests, 591. 

 Silicified wood, 361. 

 Silky luster, 279. 

 .sillimanitc, 461, 614, 681. 

 Silver, 290, 578, 597, 631. 



glance, 297. 

 Similar faces, //. 

 Sipylite, 669. 

 Skutterudite, 315, 621. 

 Smaltite, 315, 598, 621. 

 Smarskite, 634. 

 Smithsonite, 392, 603, 649. 

 Smoky quartz, 359. 

 Snow, 337. 

 Soapstone, 500. 

 Soda, 558. 



Sodalite, 438, 604, 610, 675. 

 Sodalite group, 438. 

 Soda niter, 520, 600, 639. 

 Sodium, tests for, 564. 

 Solutions, 248. 

 Space-lattice, 4- 

 Spadaite, 671. 

 Spangolite, 642. 

 Spathic iron ore, 388. 

 Specific gravity, 261. 



heat, 239. 



Specular iron ore, 344. 

 Sperrylite, 287, 623. 

 Spessartite, 444, 666. 

 Sphaerite, 518, 656. 

 Sphserocobaltite, 393, 669. 

 Sphalerite, 301, 596, 602, 606, 607, 630, 

 649. 



