GLOSSARY A]\D INDEX OF TERMS. 



IX 



pearance like porcelain, or like 



the surface of a tooth. 

 Evaporate. To become a vapor ; 



to cause to become a vapor. 

 Even fracture, 65. 

 Exfoliate. To separate into thin 



leaves, or to scale off. 



Fault. Dislocation along a fissure, 

 as often in coal beds, 87. 



Feldspathic. Containing feldspar 

 as a principal ingredient ; con- 

 sisting of feldspar. 



Ferruginous. [Lat. ferrum, iron.] 

 Containing iron. 



Fetid, 66. 



Fibrous, 52. 



Filament. A thread-like fiber. 

 Finery furnace. A furnace used 

 in the conversion of cast iron into 

 bar iron. 



Filiform, [Lat. filum, a thread,] 53. 



Flexible, 53, 65. 



Fluate. Containing fluoric acid. 



Flux, [Ln.fluo, to flow,] 69. 



Foliaceous, 53. 



Forceps, Platinum, 69. 



Fracture of minerals, 65. 



Friable. Easily crumbling in the 

 fingers. 



Fundamental forms, 23. 



Furnace, blast, 233 ; reverberatory, 

 327 ; Catalan, 237. 



Gallery. A horizontal passage in 

 mining. 



Gangue, 204. 



Gelatinize, 67. 



Geniculate. [Lat. genu, knee.] 

 Bent at an angle, 43. 



Geode. [Gr. gceodes, earth-like.] 

 A cavity studded around with 

 crystals or mineral matter, or a 

 rounded stone containing such a 

 cavity. 



Glance. [Germ, glanz, luster.] 

 Certain lustrous metallic sulphu- 

 rets of dark shades of color. 



Glimmering. Glistening, 56. 



Globular, 53. 



Goniometer, common, 47 ; reflect- 

 ing. 50. 



Granular. Consisting of grains. 

 Granulate ; to reduce to grains. 



Hackly, 65. 



Hardness, scale of, 64. 



Hemihedral forms, 37. 



Hepatic. [Gr. hepar, liver.] Hav- 

 ing an external resemblance to 

 liver. 



Hexagonal prism, 27. 



Hexagonal system, 33. 



Homogeneous. Of the same tex« 

 ture and nature throughout. 



Hyacinth red. Red with yellow 

 and some brown. 



Hyaline. [Gr. hualos, glass.] Re- 

 sembling glass in transparency 

 and luster. 



Hydrated. [Gr. hudor, water.] 

 Containing water. 



Ignition. [Lat. ignis, fire.] The 

 state of being so heated as to give 

 out light ; at a red or white heat. 



Impalpable, 53. 



Implanted crystals. Attached by 

 one extremity. 



Incandescence. White heat. 



Incrustation. A coating of mineral 

 matter. 



Indurated. Hardened or solidified. 



Infiltrate. To enter gradually, aa 

 'water, through pores. 



Infusible. In mineralogy, not fusi- 

 ble by means of the simple blow- 

 pipe. 



Inspissate. To thicken. 



Intumesce. To froth. 



Investing. Coating or covering, aa 

 when one mineral forms a coat- 

 ing on another. 



Irised. [Lat. iris, rainbow.] Hav- 

 ing the colors of the spectrum. 



Iridescence, 57. 



Isomorphism, isomorphous, 74. 



Juxtapose. To place contiguous. 



Killas. In Cornwall, the schist osa 

 rock in .which the lodes occur. 



Lamellar, 53. 



