!M> 





Sphene, 50.1. I. |C, 



Sphenoid, 



iirthorhomliic. / /\. 

 Spim-1. :7i. 606, 610 

 group, 371. 

 twin 



Splint. T\ . 258. 

 Spodumene, 426, 005, ' 

 Stalactite, 273. 



Stalagmite, 273. 



Stannite. :ti ' 



Star i>!' tin- south diamond, 383. 

 Stassfurtite, 522. 

 Staim.lite, 477. r.n:,, (ilO, 680. 

 bite, .VM. 



Stel/.lierite. 1,1.'. 



Stephanite, 325, 597. 

 Stercorite. 



Stenographic projection, 4&- 

 Sternliernite. ''-'" 

 Stihnite, 295, .V.I7, 623. 

 Stillntc, 4.s;i, tlicj, 670. 

 Stilpnoiiiclaiir, 4t8, 659. 



Stnki'Sitr. 646. 



Stulzito, M5. 649. 

 Straiulit extinction, 187. 

 Stn-ak. -': 

 Stream tin, 34t. 



^iti-, 5ie, 054. 



-. :MH, 629. 

 Strontianit.-, 3M, ti((2, 660. 

 Structural formula, W7. 

 Struvitf, //,V, C.:,!',. 

 Stylotypitr, f.L'.S. 

 Subconclioidal fracture, 258. 

 Stililiiiiati-s, 7. .Vi7. 



SulpharaenatCB, 3?3. 



Sulphates. 238. 



Sulphides, 232, 2M. 



Sulpho acids, 232, 320. 



Sulphohalite. 6US 



Sulphur, 284, 587, 601, 606. 640. 



Sulvanite, 629. 



Supph-iiicntary forms, 27. 



tu ins, 140. 

 Surfaces of crystals. 266. 



SlI-S.Ait,-, tilil. 



Sval.ite, (i. r 3. 

 Svanhcrnit, 



Swallow-tail twins, 536. 

 Sylvanitc, IlL'ti. 

 Sylvitc, 328, (UK), 639. 

 Symmetry. / .'. 



alternating, /.7. 



axes of, /.i. / -. 



center of. /.)'. 



planes of, IS. 



paeudo-, 14fi- 

 Synadelphite, 652. 

 Syngenite, 638, 662. 



IllOIIOcllllic, IfO. 



ortliorhomliic, 1X3. 



triclinic. 



!..-(., tup,, neiit, M9. 



-, for lilowpipe detertninati. 

 oi' roi-k-foriuiiiK miii' 

 for determination of common miner- 

 als, 596. 



of cnat> .,), ,-,,;,! 



for fuwihility. ~>~>.~>. 

 Talnilar hal.it. 2M. 

 Tachydrite, 639. 

 Tanilite, 644. 



Talc, 500, 601, 614, 663, 679. 

 Tantalates, 236. 

 Tantalite. 506, 635. 

 Tantalum, 571. 

 Tapalpite, 626. 

 Tapiolit<-, <;:5r,. 

 Tarnish, 275. 

 TMte, 018. 

 Tavistokito, 655. 

 Taylorite, B 

 Tellurates, 236. 

 Tellurium, r>^7, c.Ji;. 

 Tenacity. 258. 

 Tennantite, 324, f,_'l. 

 Tenorite. 340. 

 Tephroite, 451, 665. 

 Terlinmiaite. ti-J 1 . 

 Teeral central, 59. 



holoaxial, 61. 



polar, 62. 



Tetartohedral forms, 27. 

 Tetradymite. fiL'.V 

 Tetragonal alternatinu, 7>'>. 



axial ratio. ,s ' .'. 



axis, 14. 



equatorial, 72. 



hemihedral, 72. 



holoaxial, 75, 



bolohedral 



holos\ in metric, 65. 

 polar, 78. 

 prism. /;?. 



1st order, H7. 



Jd order, 68. 



:<d order, 

 pyramid, 66. 



1st ord.-r. '>. 



2d order, 67. 



3d order, 78. 

 scalenohedron, 69. 



