OT citi 
Mineralogy and Geology. 435 
Phosphate of lime nodules in Silurian rocks of Canada.—W. E. 
Locan in Rep. Progress of Geol. Survey of Canada, 1852, p. 28; 
with analyses by T. S. Hunt, p. 105. This volume, p. 129. 
On Childrenite ; C. RaMMELSBERG, (Pogg Pane , Ixxxv, 435).—This 
rare mineral is trimmetrié; with the ax s 06711 :1:063912. The 
crystals are yellow, yellowish brown, end Reena black, and form 
uses on spathic iron. G=3-28—3:247. H=5. Gives on heating 
much water, colors the blowpipe flame bluish green, and with the fluxes 
gives the reaction of iron and manganese. Dissolves in muriatic acid 
in powder after long digestion, and the solution contains ee 
acid, ralumine, and the oxyds of iron and manganese. Analysis 
Mn g 
28-92 14-44 30-68 9-07 O14 16°98 
Oxygen 16°20 674 681 2-08 014 15°09 
gen ratio for acid, peroxyd, protoxyds and water, 15: 6:8: 15, 
giving the formula (2 Ra Ba Ae B)+4 15H. 
Quartz.— A large 6-sided prism, 2 feet long, as eee by Prof. C. U. 
SHEPARD, now weighing 175 pounds, was foun /aterbury, Vt. by 
Me. M Carleton. The a ot se broadest branes planes is 14 
ot of the others, 8 and 9 in 
al.— Analyses by G. ile ne d. Chem. u. Phys. Geol. ” ii, 
185), Liebig und Kopp’s Jahresb, for 1851, 762) of I, a brown shining 
o 
opal from Trachyte of Rosenau in the Siebengebirge ; Il, a dull yellow- 
ish, ib.; III, a yellow, ibid ia ignition : 
Bi x1 Fe Ca Mg kK 
Ta 9612 050 330 iérace 008 —=100—Iose by dguition su 
Lb 9600 3:49 640 006100 “ 
Ia 9449 060 485 trace 060 —=100 “ “ * - 71 
1,6 94-67 5-26 ce OE OUST = 5-95 
Ill, 95:55 437 —_- -— = 99°92 
Magnesian Opal, from near Harmanjick, Asia Minor.—J. Law- 
RENCE Sire obtained for the oo of this opal, which occurs 
With serpentine and carbonate of magnes : 
Silica 92-00, Water 4°15, Magnesia 3:00. 
It occurs also on the island of Mytilene. 
Datholite of Isle Royal.—Analysis of the massive variety by Poeres 
Watney (loc. cit., p. 101). a aoe 
én ee 
ae 34:68 2188 (eas) ee 2, © 
Gymnite.—A se ine mineral from the T tibed by Lres- 
ENER and aed Von examined by Ae Oellacher (Zeitschr. d, Ager 
~ — pe: 922+ im Ausz. Jabrb. d. k. k. geol. Reichsanst. 
1850), iv, 608: here from Lieb. u. Kopp’s Jabresb. fiir 1851, 
and F. Kobell (Minch, gelerte Anz. (1851) xxxiii, 1; 
lt looks like gum arabic, and is brittle, 
transparent or translucent; color yellowish white to honey-yellow. 
