134 Seventh Supplement to Dana’s Mineralogy. 
Crocorstre [p. 359].—Dauber has measured the angles of crocoisite with great 
care and published t ~~ results i in Pogg. Ann.,‘cvi, aie ae makes I: J=36° 31'6, 
#2 :42==50° © 92’ 43’’, with a possible error of 1/ 52’’, and the axial 
ratio for the pitatiaconsl clinodiagonal and eka axis, is 1: 0°96388 : 0°91751. 
Dewertire [p. 285].—Kenngott in his last supplement (p. 67, paul in aged 
ecntinues gi igh 2 slo gil under Gymnite, although the former na 
er rity. 
Lioaire [p. 446, IIT].—Massive diallogite has been found at Placentia Bay, 
Newfoundland [f, S. ‘Hunt in Logan’s Can ada = for rie in — supposed to 
be ian age. Color fawn- ih prs stil 13 It contains, 
i . Hunt, 84°6 p. c. of carbona eof bac Do etd rr r cent of 
silica, with small portions of iron, tine and espe Al but two per cent of the 
silica mia ae soluble in a dilute solution of potas 
mires [p. 441, I, II, ive pont hy of many dolomites - ater by J. 
W. "Mallet are given in Tuo s Second Biennial cog teeg port of Alabama; also 
of dolomites of Canada, by Ts S. ghoogg in Logan’s Geo ras Canada for 1857; and 
in I J. D. Whitney in Hall and Whitney’s Towa 
omitic veins or spots in fossiliferous wissen AL ing to the investiga- 
tions of T. S. Hunt (Logan’s Canada Rep. for 1857, p. 200), “gto pravieh | nai 
limestone of Dudswell is ordinary limestone consisting of carbona magnes 
13, sand 6 2, and the rest carbonate of lime. The fossils have a aaa pene 
material enyelops the fossils or fills ie veins, which is dolomitic, 
oI 
Cad Mg& FeO Insoluble, sand 
56°60 11-76 26°72 = 98°31 
There is here a mixture of dolomite wit carbonate of lime ; by means of acetic 
acid the latter was rseagaas coe but 4°0 p. ¢. of carbonate of een a) and the 
residue (52 per cent) then g 
Cad 
gC 
' 51°75 85°73 
The Portor marble, a well-known black oe with yellowish veins, brought 
pag the sed te" ae ote (and according to Savi of the Neocomian fo iesege* also 
lyzed b Hunt, afforded the same resulta The a Sadly « of the rock contained 
aly £ ‘0 per = of carbonate of magnesia, while the veins afforded 35:5 per - vik 
Ducktownite-—See page 129, 
Dorrevoystre [p. 77, I, — Ill, IV, V].—This prismatic mineral from Binnen 
9 contains, ac cording to tockar-Escher, (Kenngott’s Min. Forsch. for 1856, ’57, 
p. 
Pb g Fe 
23°97 22°01 53°30 0°24 oan 99°52 
24°22 25:27 49°22 94 025 = 99°90 
25°30 26°33 46°83 1-62 — = 100°08 
25°77 26°82 47-39 trace — = 99°98 
The need result gives the formula 3PbS+2As*S*. The last two analyses also ap- 
proach mula 4PbS bS+3As*S%, aoa Apes from that of plagionite or jame 
sonite, int tngteraeh titution of arsenic ft ony. 
ELLAGITE, A. E. Mord (See =. gee owl and Jahrb. Min., 1858, 
oe —Probably monoclinic; two cleavages ma 0° with one anot Lustre 
of cleavage surface pearly, shining; opake or “feeble wanduner Color yellow, 
ish brown to yellowish red, Streak uncolored. B.B. yields water and with 
hite Aoland in Finland. Formula deduced 
te heat an enamel-white pearl. From F 
i+ Si+128f. 
Enaroite.—F. Field has described agh bs Jom. Pagie aig under the age of roan gg | 
@eanile, an ie t of copper whic! has identified wi 
contains, to Field, S 31:32 As 19 ‘i Gn isto eed with iieec of owt 
and silver. The deduced is 36uS+ AsS5. H=35—4. G=£39. 
