Sixth Supplement to Dana’s Mineralogy. 351 
Prof. Brush compares the composition with that of liebenerite and the potash 
inites in a table, and suggests that some of the latter may have the same origin. 
e also points out a close approximation chemically to agalmatolite (in — po 0g 
tribite and parophite. All are probably — he alteration or metam 
es perhaps ve from_ different original ingredients, just as kaolin race come 
m. mg: 
se fp. d IV].—According to H. Rose (Pogg., eit 314), the spe- 
cife i piaviy of ridelinits after thirty trial, is ee to 4226, and after heating 
£287 to 4-456; the loss by ignition 0°38 t 
Gas—Gases of Volcanos, Deville, Ann. Ch. a [3], lii, Jan. 1858, p. 5. 
— ee 
LD [p. 7, II, V]—New deposits have been found on _Frazer’s river, 
not of Oregon, neal others ei Pike's Peak on the River F in 
estern K 
Bronn’s N. Wakrb i857, 395), from Mauestary in the ci sa It: reales 
e 
Sesquioxyd of iron, In thin lamelle aggregated together; H=1; G.=1°87; lustre 
greasy, as in pinguite ; no wer mell when moistened. BB. acts like pinguite, 
_ and in a tube becomes dull brown, giving off much water; becomes m eae De- 
— perfectly in acids, but with difficulty. Composition, according to Berge- 
“ 
5 Fe Al Fe Mn Me €a K iH 
3839 9546 687 280 067 O75 056 ILi14 2896=100, 
; Tne oxygen of the silica is about twice that of the bases. The mineral has pro- 
i ceeded from the decomposition of some. feldspathic rock and by the | ccatitation of 
. uloxyd of iron for alumina. 
Siac ae ‘ip. 76 ].—Found in cob-web forms at Chonta, Peru. W.J. Tay- 
Housexy aa PYROXENE iP 170, and I, II, IIL, IV, V].—The relations of 
oxene and Sedcfendle are review ; Rammelsberg i in Pose. oo, 3 ciii, 284. a 
: ind composition of the diffe te od of the species are considered by the 
ted, as Rammelsberg has fol- 
* 7 ni MK 
tion of these two species in angles but did not ee their ocean m rebasiche to 
¥ 2. 
: also lations of § 
the writer, in this Jour. Sci., vol. x, Ba 120 > (1850), © ie i also the relations in 
manner 00 
& composition are shown, in the opted TS 
: same erystallographic relations by Rammnelaber in 1852, Pogg.. lxxxy, 544, 
. — e of Brelthaupt 4s a — = us hornblende from Edenville, N. Y.; 
J=124° 29’, G.=3-059, R. (2 
irine from Brevig is a pyroxene with er angle I: J=86° §9*° "The name is 
also improperly applied to a black hornble lende from the same eye Aecmite is 
: = to have the form ey and Pyrozene a simple relation in form 
lende generally [see Mi a 
He takes red oS eee B sSehe divi the peg As to 1, silicates 
, dividing 
e 
= ; 2, sili d sesquioxyd of iron; 3 prot 
“s Petey ie; 5, oicatin of PR oie gyn xy! : Jorpoeate 
4, silicates of protoxyds with alumina and no sesquioxyd of iron, as in cro 
The aluminous species all contain alkalies, 
ot er di 
: de) have in genera foaydt—The light wore Sit, White arsed (malaco- 
