114 Fourth Stipplement to Danas Mineralogij. 



CflALTBiTE [p. 444, and III]. — The massive clayey spathic iron, kno-^n as the Bal- 

 timore ore, occurs in nodules in a bed of white clay underlying the tertiary on the 

 ■west side of Chesapeake Bay and extends along fur fifty miles.^C. E. Smith, Pro- 

 ceedings Acad Nat. Sci., Philad., viii, 102. 



■'^t*Earthy chalybite occurs with the coal measures of Kentucky, especially in the 

 lower coal measures. Sp. gr, varies from 3'135 to 365. Owen's liep. Geol. Ken- 

 tucky, 1856. 



Chathamite [p. 56, 512].— Shepard, in his 3d edition, p. 311, keeps his so-called 

 Chathamite separate from chloanthite, and arranges gcrsdorffite, quite another spe- 

 cies, between them. [According to the analyses, it is only a chloanthite with 12 or 

 13 per cent of iron. Some Schneeberg chloanthite contains 6 to 7 p. c. of iron. — P.] 



Cherokine [Suppl. III.] — Is chiefly phosphate of lead, according to Prof. Shepard 

 (Shep. Min. p. 401 and Am. J. Sci. xxiv, 38), in addition to the pliosphate of alumina 

 and zinc, mentioned in Supph HI. [This confirms our reference of the species to 

 pyromorphite, of which it appears to be an impure variety. — n.] Color white, 

 pinkish within, often greenisli or bluish without. Lustre adamantine. Form hexag- 

 onal with low pyramidal summits. H. :t=3-75. G. = 4 81. — See also Genth, this 

 Jour., xxiii, 422. 



■ 

 t 



Chlouite [p. 294, 296.] — The Pennine of Zermatt and Valais, according to M. 

 Descloizeaux (L'lnstitut, No. 1207), is mostly negative, optically, whilst that of Ala 

 in Piedmont is positive, or without action on polarized light. On optical grounds, 

 Descloizeaux unites the leuchtenbergite and white chlorite of Mauleon with the 

 positive Pennine. While with the type of cHuochlore, He would unite on the same 

 ground, the hexagonal chlorite of Achrnatowsk, Ala, Traversella, Tyrol and Taberg- 

 He holds also that the ripidoHtes, very rich in oxyd of iron, should constitute a 

 group apart, comprising the riptdolite with contorted plates of St. Gothard and 

 the Grisons, and the scaly chlorite disseminated in abundance in the granites of 

 the Alps. 



C. Heusser has examined the pennine of Zermatt with polarized light, but without 

 observing any colored ruigs or the black cross, so apparent in rhombohedral crystals. 

 (Fogg, xcix, 174). 



A green chlorite-Uke micaceous mineral occurring with the margarite of the Tyrol, 

 proves on analysis by Hetzer, to contain (Kenng. 1855, 48) : 



2-30 = 98-19 



Si 



51 



Fe 



Jjlg 



Ca 



F 



28 04 



23-94 



25-50 



15-74 



1-69 



0-98 





22-43 



25 91 



15*61 



117 





Besides, there is some alkali. Hcintz, wlio describes the mineral, states that the 

 composition requires farther investigation, as the analysis affords no good formula. 

 [The Corundophlliie of Shepard may be identical with this mineral. — J. d. d.] 



CuLORin OF Iron. — Scacchi mentions the chlorid of iron, Fe^Cl^, as among the 

 products of the recent eruption of Vesuvius (Eruz, Vesuv. 1850-1855); and at- 

 tributes the yellow color of the lavas about the fumaroles partly to tins species. 

 Hausmann noticed the species at the same crater in 1819, and describes it as an 

 incrustation of a brownish-red color, light or dark, easily soluble in water and alco- 

 hol, and vaporhiihle before the blowpipe. 



The existence of the protochlorid of iron at Vesuvius was announced by Monti- 

 celli and Covelli ; but Scacchi did not obtain any sure evidence of its existence there 

 in Lis researches. 



CHavsoLiTE [p. 184, and I, II. III.] — Tiie iron in the analysis by Damour cited in 

 tlie 3d Suppl. snould be protoxyd and the water 1-75. Damour's paper is published 



in the Ann. des Mines, [5], viii, 90. A second analysis afforded, Si 36'87, titanic 



acid 3-51, "Sig 50-14, f'e6 21, iftn 60, tt 171 =99 04. The color is brownish red» 

 and the powder orange -yellow. G.=3'250. B.13. infusible. 



CisN-ABAR [p. 48, and IIJ. — The Idria quicksilver mine is situated in the Carbonif- 

 erous formation. It is distributed through the beds and not in veins, as if it had 

 been of aqueous origin rather than igneous. Llnstitut, No. 1204. 



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