Mineralogy and Geology. 267 
Heavy Spar.--Limpid crystals are mentioned by Mr. F. B. Hough, 
as occurring at the iron mines in Rossie, St. Lawrence Co., N. ¥.—— 
5th Rep. in Cab. Nat. Hist. N. Y., 1852, p. 43. 
Heavy Spar of Nutfield, near Bleichingly in Surrey.—Crystals occur, 
according to Prof. E. J. man, in the fuller’s earth pits in the green- 
sand formation. They are tabular in form, with the basal plane (OP) 
predominating. Description in Naumann’s system (as modified in the 
last volume of this Journal) 0, c-%, @, 1-< , 1-4, 1.—Phil. Mag. 
[4], iii, 141. 
Carbonate of Strontian, in Oneida Co., N. Y.—This Jour., xiii, 264. 
Chiolite.—An analysis of the chodneffite by M. Durnev, made under 
the direction of Jevreinov, affords, as published by Kokscharov (Pogg. 
Ann. Ixxxiii, 588)— : 
Al Na Fl Ca Fe and Mn 
13-41 32°31 53°48 0°25 055 = 100 
n one crystal, were two additional planes. There is no cleav- 
Ww 
(calling them a, y, z), v: y=113° 20’; y: y= 385° 45's a 2 2—69° 10. 
ing differences, 
yl, which would 
r widest 
Identity of Williamsite and Serpentine. —HERMANN has analyzed 
Pa Williamsite of Shepard, and points out its identity with serpentine. 
€ obtained (J. f. pr. Chem. liii, 31)— 
Si Al e Ni Mg H 
4450 0°76 139 «090s 89°71 1275100 G=260 
Oxygen 2309 -—— 030 019 15°80 . 
The oxygen ratio afforded, for the water, protoxyds and silica is 
2-07: 3: 4-24, or nearly 2:3:4. [See for another analysis of wil- 
liamsite by Mr, Brush, Dana’s Mineralogy, 3d edit., p. 692, where the 
conclusion is stated that the mineral is an impure serpentine. 
Brush obtained 3-35 p. ¢. of alumina. ] 
RB 
