Fourth Supplement to Danas Mmeralogy. 121 



HYPOXANTHITE, ^own^y.— The " Sienna earth" has thus been named by T. 

 H. Kownej (Ed. Phil. Jour., [2], ii, 808). It is a brownish -j el lo"W" ferruginous clay, 

 J^robably a mere mixture. G.=3-4G. B.B. infusible. Analysis obtaijied, 5i 11 '14, 

 Jtl 9-47, Pe 65-35, Ca 53, % 0-03, fi 13-00 = 99-52. 



I Iodine. — M. Bornemann states that be has proved the presence of iodine in a free 



state in the vapors of the fumaroles of Vulcano (north of Sicily). — L'Institut, No. 

 1205. A white paper was turned blue by the gases, and iodine was found to have 

 the same effect on the paper. 



Kerargyrite or Horn Silver [p. 92], — Occurs in Russia in the Altai at the mine 

 Suieinogorsk in pieces sometimes two tingers thick ; also at the mine Krukowskoi, 

 Kokscharov, Min. Russl., ii, 284. 



Lanthanite [p. 456, and I, III]. — Analysis by Dr. F. A. Gentb (Am. J. Sci., [2], 

 xxiii, 425), 2108, Ea 5495, fl (from the W) 23-97=100. G.=2-605. In an- 

 i other trial, Ea 54-83. Confirms the examination by W. P. Blake. Announced by 



Prof. Shepard as occurring at the Canton Muie, Georgia, in this volume, p. 43. 



Laumontite [p. 307]. — The Laumontite of Saruthal uearBotzen in Tyrol, has been 

 analyzed by H. Gericke, as follows (Ann, Ch, Pharm., xcix, 110) ; 



P 



M 

 y 





Si 



3^1 



J^e 



Ca 



Na 



fi 









1. 



54025 



22-405 



0-194 



11-775 



1-309 



10-993= 



=100-701. 



G.= 



=2-280. 



2. 



63328 



20-775 



0-336 



12185 



2-638 



10-448=: 



= 99-610. 



G.= 



=2-281. 



3. 



54-484 



21-662 



0-274 



12146 



1-086 



12-185= 



=101-737. 



G.= 



=2-280. 



4. 



53-161 



22-767 



0149 



9*334 



3316 



11-899=: 



-100-616. 



G.= 



=2 310. 



No, 1, crystalline-foliated aggregate, somewhat altered; 2, fine crystal fragments; 

 3, still less altered, the fracture showing an especially fresh surface. Oxygen ratio 



in 1 and 2, for Ii, K, Si, ti, 1 : 3 : 8 : f ; for 3 and 4, 1 : 3 : 8 : 3, the last giving the 



Laumontite formula, excepting a deficiency of water, viz. Ca3 Si^-f sil Si^-f 9fi. But 

 supposing that the Laumontite loses part of its water at 100° C, which H. Rose 

 asserts, and estimating the water existing near that temperature, the three trials 

 afforded 15759, 16194. 15*338 p. c. of water, giving the usual formula, or the above 

 excepting 12fl in place of 9lX Prof. Naumann has found the angle of the prism 

 to be 86^ 15', conhrming the conclusion from the analyses that the mineral is Lau-. 



montite. 



The Caporcianite of Savi, Gericke observes is probably nothing but a Laumontite 

 which liuo lost part of its water. The angle also in Leouhardite, according to 

 Brooke and Miller, is 86° 16^ 



The zeolite, from the Island of Skye, analyzed by Prof. Mallet (Am. J. Sci., [2], 

 xxii, 179), has been shown by Dr. Heddle (Phil. Mag. [4], xii, 652) to be Laumontite. 

 Laumontite occurs at that locality in veins about one inch in thickness, having a 

 granular structure arising from an aggregation of minute crystals. 



Na-hve Lead [p. 17 and HI]. — Xjitive lead, according to G. A. Stein (Wohler, in 

 Ann. d. Ch. u. Piiarni., c, 127), occurs in Mexico, at the mine San Guillermo, near 

 Perote (Vera Cruz). It occurs in laminm in a thin foliated galena which contains 

 2 to 3 ounces of silver to the hundred weight. 



Leucopiiane [p. 182, and II].— Rammclsberg (Pogg., xcviii, 257) refers Icucophane 

 to mehnophane of Scbeerer. Analysis afforded him : 



Si Se Si Ca Sfg ]5ra S: F fl 



1. Lenonphane, 4703 10 70 103 2337 0-i7 11-26 030 6 57 — =100 43. G.=2964 



2. Melinophane, 43 66 11-74 1-57'^ 2674 Oil 8-55 140 5 73 30= 9y-80. G.=30ia 



« "With traces of Fe and Stn. 



The oxygen ratio for % 5, Si in L is 9-65 : 7*26 : 2442, and in 2, 1007 : 8-17 : 2267. 

 But supposing the fluorine united to the sodium, it reduces _1 to 671 : 7'26 : 2442 ; 

 and 2 to 7-64: 817 : 2267, approximating to the formula Cu'^Si'+^e Si+NaF. 



[Supposing the fluorid of sodium to act as a base in the silicate, like the prot- 

 oxyds, and reckoning together the fluorine and the oxygen of these bases, the pro- 

 portion becomes for 1, H-95 : 7-26 : 2424; for 2. 1468 : 8-17 : 22'67, And in this 



SECOND SERIES, VOL. XXIV, NO. 70.— JITLY, 1957. 



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