GLOSSARY AND INDEX OF TEEMS. 



Shale, 341. Shining, 56. 



Silicate, 74. 



Siliceous. Consisting of, or con- 

 taining silex, or quartz. 



Silky, 56. 



Silurian. A term applied to the 

 fossiliferous rocks, older than 



. the coal series. 



Slag, 205. 



Smelting of iron ores, 233. 



Spathic, (Germ, spath.) Like spar. 



Spar. Any earthy mineral having 

 a distinct cleavable structure and 

 some luster, as calcareous spar. 



Stakictitic, (Gr. stalazo, to drop or 

 distil,) 54, 116. 



Stalagmite, 116. 



Specific gravity, 63. 



Splendent, 56. 



Splintery. Having splinters on a 

 * surface of fracture. 



Stampings Reducing to coarse 

 fragments in a stamping mill. 



Stellated, (Lat. stella, star,) 52. 



Strata. A series of beds of rock. 



Streak, streak-powder, 56. 



Striated. Lined or marked with 

 parallel grooves, more or less 

 regular. 



Stockwerks. In Cornwall, works 

 in beds and veins of ore. The 

 works in alluvial deposits are dis- 

 tinguished as stream-works. 



Sub. In composition, signifies be- 

 neath ; also, somewhat, or imper- 

 fectly, as submetallic, means im- 

 perfectly metallic. 



Sublimation, (Lat. sublimis, high.) 

 Rising in vapor, by heat, to be 

 again condensed. 



Submetallic, 55. 



Subtranslucent, 58. 



Subtransparent, 58. 



Subterbrand. A name given to 

 Bovey coal, or brown coal. 



Subvitreous, 55. 



Sulphate. A salt containing sul- 

 phuric acid. 



Sulphureous, 66. 



Sulphuret. Combination of a met- 

 al with sulphur. 



Tarnish, 57. 



Tertiary strata. Strata more re- 

 cent in age than the chalk, and 

 antecedent to the recent epoch. 



Tesselated, (Lat. tesselatus, che- 

 quered.) Chequered. 



Tesseral system, (Lat. tessera, 

 four square tile, or dice,) 32. 



Tetrahedron, (Gr. tetra, four, he 

 dra, face,) 37. 



Titaniferous. Containing titanium 



Transition rocks. The older silu 

 rian, which were formerly sup 

 posed to contain no trace of fos 

 sils. 



Translucent, 58. 



Transparent, 58. 



Triclinate, 33. 



Trimetric, 33. 



Trimorphism, 44. 



Truncation, truncated, 35. 



Tufaceous. Like tufa, 347. 



Tuyeres, or twiers, 234. 



Twin crystals, 42. 



[Tnctuous. Adhesive, like grease. 



Lstubtion. [L. ustulatus, scorch- 

 ed, or partly burnt.] Roasting 

 of ores. 



Veins. I<* career's use, small lodes. 

 In geology, any seams of rock 

 material, intersecting strata cross- 

 wise. 



Vein-stone. Thfc gon L r uo of a met- 

 al or mineral. 



Verdigris-green. Gre^K inclining 

 to blue ; the color of yerdigrw. 



Vesicular. Containing small v*, 

 cuities. 



Viscous, 65. 



Vitreous, (Lat. nitrum, glass,) 5f- 



Vitrification. Conversion to glass 



Volatile. Capable of passing easi 

 ly to a state of vapor. 



Washing of ores. Exposing then? 

 after stamping, (or before if ir. 

 fragments,) to running water 

 which carries off the earthy ma 

 terial, it being lighter than tha 

 ore. 



Zeolitic. .Having the nature of a 

 zeolite, 163. 



