Kighth Supplement to Dana’s Mineralogy. 379 
with traces of fluorine, ammonia, baie and carbonic acids. [This substance 
is evidently rea nearly related to paasancemg pra is prot a result of the alter- 
ation of that mineral. Hermann endeavors w that silica is an essential con- 
stituent of pitchblends and allied u uranium phe ay but as most of these su 
are amorphous, and as their composition varies posh map. pan it ri a possible that 
the silica may be due to admixture with some earthy silica’ Ae} 
. —See Pitchblende. 
mxvm [p. 12, I—IV].—Analyses of platinum from tte localities, by H. 
Solar Deville i H. Debray (Ann. de Chimie, [3], lvi 
ee Jt. Rh... Pd - Au Oe-Fs nae Sud Pb) Oséloss 
- 8620 085 140 050 100 060 780 
ui P 
2% 8000 155 250 1:00 150 065 7 1 is pi “Tacs is 
8. 7682 L118 1:22 1:14 1:22 088 743 798 241 — =10028 
4. 8550 1:05 1:00 060 080 140 675 1:10 2-95 =10115 
5. 1985 420 065 195 055 O75 445 495 onl 
6. 7650 0:85 1°95 1:30 1:20 1:25 610 7:55 1°50 055 12510000 
7. 5145 040 065 O15 0°85 215 430 3730 300 —- —-=1 
8 45°70 095 265 085 315 105 680 2853595 —~ 00510000 
9% 59°80 2:20 1:50 150 2:40 1:10 430 25-00 1:20 iim $e 
10. 6140 110 185 1:80 1-20 1:10 455 2600 120 —~ —-=100:20 
Il. 7750 1:45 280 0°85 undet. 2°15 960 2°35 100 — #9010006 
12, 7640 4:30 0-30 1:40 "040 4101170 050 140 — 00°50 
a.) lridosmine. 
Nos. 1, 2, and 3 from _— (Col seoaad South ogo te 5, and 6 from Califor- 
; 7, Ore regon; 8, Spain; 9, 10, Australia; 11, 12, 
For analyses of platinum ore fee — oeng Lawack | o Borneo by Prof. Bleek- 
tole see Pogg. Ann., cvii, 189. 
Pratres [p. 54, I, IV].—G. Rose has described a Racpeqpaiad ig of pyrites after 
Pyrrhotine, the ery 1} are six-sided prisms, two inches ac ant aul inch in 
thickness (; "arn tschrift d. deutsch. geolog. Gesellschaft, x, 98 ). 
Prrouonpatre [p. 400, II, IV ccAnelione of Russian pyromorphite by Struve 
(Kokscharow, Mat. zur Min, ye ds, iii, 42): 
‘pb Pe, Gr As v s 
6715. 994 13886 069 —— ni pet 
~ eden neds 1@13 . 4340): FE ashen 
Preoxene [ described a ee white pyroz- 
p. 158, I, 11, V—VII].—Reuss has descri 
‘ne from Sot The nin in Bohemia. loner the microscope it a crystalline 
e mineral i he te when 4 f 
pling weasaee! with: chr girth ocolla eacine se ag pee OE 
sed b corn dric acid with gelatinization. . 
Prin A ig ay xx 4 om 
My. $< Be Mn 
5508 20-72 ig 4°84 3'16==99°46 
ste bane [p. 50, I, 17]. Be gap eee yrrhotine from Bernkastel on ae 
(ehinde gave Fe 61-0 case ae ae Sei a bi ete d. naturhist. i 
igo oe s. 1 on nickeliferous 
B. el a ii, 804. 
ae ie 145, II—IV, VIt].—Blum nee Carius have described nate re 
a nf pcgpr from Girgenti, The crystals contained Si 98 80, 
. - ciii, 628, in Kopp’s Jahresbericht, 1868, 745). 
AR [p. 31, v1 —Anal f realgar from Pola de Lena in Asturia, Spain, 
i Pet er ( dis ie Clee: "Soc, xi, 242 42) gave S 30-00, As 70°25. 
f{ this mineral 
296, I, V].—An in and Lg oy Bia variety of 
im Stele’ pig nie Co. 3» North Caroling, has been described by Dr. F. 
in this Journal, [2], xxviii, 250. Composition 
