Foui^th Supplement to Dana's Mineralogy, 119 



|Na+!^Ca)^ Silica 40-26, alinnina 29-83. lime 20S4, soda CrOO, vraicr 13'08 

 100, Still, the otlier is probably the true ratio for the iiiiuerul.] 



FuEisLEBEMTE [p. 79, and III]. — The Freslebcnite of Iliondelenrina in Spain, ac- 

 cording to Mr. Escosura ( Re vista Miacra, vi, 358, Ann. dea Mines, t^J. Viii, 495), 

 occurs with silver glance, red silver, spathic iron, iron and cupper pyrites^ blende, 

 galena, antimony glance and other ores of lead and silver. G.=5-6 — 57. H.=2*5. 

 Form irwutric ; the prism is striated and terminates iu a brachydome of 120^ (top 

 angle). Consists of 



Sulphur 17-60 Antimony 26-83 Lead 31-90 Silver 22-45 



Gadolunite [p. 211], — Hermann points out tbe lioraceomorphism of gadolinite 

 and euclasc. Both of these species contain glucina, and the oxygen df the bases ex- 

 ceeds that of the silica, the formula corresponding most nearly to (R^, K)Si*, like 

 - that of euclase. — Het. Min. Syst. 



Galeva [p. 39, 506, and If, III]. — Schx^arz has found 602 p. c. of cadmium in a 

 §ralena from AUenberg. — xxxii Ber, der scliles. Ges. £ vat. Cultur, 277, in Kenngott's 

 ilin. Forsch. I 1855. 



Garnet fp. 190, and I, II, III]. — Analvses of garnet by Damour (L'Institut, No, 

 1198, Dec. 1856): 



Si 



1. Black, from Frascati, 35'84 



2. Bottle-green, Zermatt, 3603 



Si 



3Pe 



Ca 



Mg '11203 ■ 



6'24 



23-12 



32-72 



104 1-04— 100. 



1-24 



3005 



3214 



0-54 =100. 



G. = 3-85 



Damour attributes the color of tbe first to the presence of the titanium, either as 

 oxvd, or titanic iron. 



GiBBsiTE [p. 134, 506]. — The hydrargillite or crystallized Gibbsite is not hexago- 

 nal, according to the examinations of Haidinger. 



R. Hermaim in his " Heteromeres Mineral-System," continues to describe the 

 Gibbsite as sometimes containing a large percentage of phosphoric acid and there- 

 fore a species of doubtful composition, notwitlistanding tiiat specimens from Rich- 

 mond, Mass. have been repeatedly analyzed iu this country with reference directly 

 to the phosphoric acid, and none found, or only a trace. Recently a mine of limou- 

 iia in Chester Co., Pennsylvania, has been found to afford a stalactitic mineral some- 

 times exceedingly hke Gibbsite in external appearance, which is in fact wavellite* 

 It is hence easy to see hoTV M. Hermann may have been led into error, but less so, 

 to comprehend why he and others abroad should persist in it. 



Glauconttk [p. 288, and IU. — The green grains of the greensand from the chalk 

 formation in Westphalia afforded W. v. der Marck (Verb. d. nat Ver., Bonn, 1855, 

 263): 



Si Si te % it I'l 



53-46 5*00 21-78 6-21 8-79 [4*76] =100, 



Greensand grains from Coal BlufiF on the Alabama river and Gainesville, Alaba- 

 ma, afforded J. W. Mallet (this Jour., xxiii, 181), No. 1, a mean of two analyses: 



gi Xl f^ 6a % t. fi[ 

 I.Coal Bluff, 57'66 6 56 2013 104 1-70 4:-88 8-l7=:10004 



2. " " 58-91 5-48 19*24 0-71 0*87 4-58 8-17, Pyrites 1*46= 99*42 



3. Gainesville, 58-74 4'7I 2106 092 1-48 Z-2^ 9-79=:99-96 



1185 p. c. of the silica in No. 2, insoluble in carbonate of soda, and iu No, 3, 

 \ 23-89 p. c. With the f^e in No. 3, traces of 3Pe. G. of 1, 2 297, of 3, 2-349. 



Grafuits [p. 29, and II]. — On artificial or furnace graphite, by K. C. von Leon- 

 hard. Leonh. u. Bronn, 1856, 398. The object of the paper is to show the great ex- 

 tent to which graphite Los been found in furnace slags or other furnace products, 

 and point out the bearing of the fact on the graphite of crystalline rocks. 



Gypsum fp. 377, and II, III].— A mineral from Bovenden near Gottingon, which 



had been called flesh-colored heavy spar, on examination by Dr. C. Schindling. turns 

 out to be gypsum mixed, within, with anhydrite, G.=:i2-49. — Lconh, u. Bronn, 

 185G, 664. 



