122 Fourth Supplement to Danas Minei^alogy. 



case, the ratio, between the osygen of the silica and the oxygen and fluorine of the 

 bases, is nearly 1 : 1, as in idocrase and epidote, and the formula nearly sfe^Si-hliSi, 

 like that of mellilite. Descloizeaux has stated that melinophane is optically uniaxial, 

 like idocrase, while leucophane is trimetric ; and this throws doubt over the inden- 

 tity. — D.J 



LiEYRiTE [p. 262J. — Planes and angles of an Elba crystal according to Descloi- 



zeaux (Annalos des Mines, [5], viii, 402).— 0, H, 3i, ix, 33, 22, t2, 1, /, 22, i2, 33, 



t3, i^ ? «4, 2i, tX /: 7=112° 38^ calculated from the observed angles of the dome 

 11 and octahedron l,both affording good faces ; but about 111° observed. 0\ H= 

 146° 24', 0:2^ = 138° 29', 1: 1 (brachyd.)=in° 27' (observed 117° 23' to 117° 

 310; 1 : 1 (over base) 102° 48' (observed 102° 44' to 102° 62'). A full table of 

 angles of the planes is given in the article. 



Analysis of the Lievrite of Herbornseelbach in Nassau, by E. Tobler (Ann d. Ch. 

 ycix, 122) : 



Si 5Pe Fe Stn Ca fl 



33-30 22-57 24-02 6*78 11-68 1-12 = 99-47 



which corresponds to the formula 3(^Ca'-f-ff'e'*) Si+2?'eSi, It occurs in crystals, 

 mostly of the form 00-2, l-oo, oo, 1; also columnar and massive. H.=6. G.= 

 3 711, or less than other lievrite, owing to the presence of manganese. 



Lnvio.viTE [p. 131, and II]. — Analyses of limonite of Kentucky, by R. Peter, in 

 Owen's Rep. Geol. Ky., 1856. 



L1NN.EITE [p. 67].— Analyses (1.) of Copper-linnieite (or CarroUite) from the Pa- 

 tapsco Mine, Maryland; and of NickeMinn.Tite (or Siegenite) (2, 3,) from Mineral 

 Hill, Md., and (4) from Mine La Motte, Missouri by Genth (this Jour., sxiii, 418): 



S Cu m Co Fe 



1. CarroUite, Md., 41-71 17-55 1-70 38-70 0-46 Quartz 0-07=100-19 



2. Siegenite, « 39 70 2."IZ 29-56 25*69 1-96 Insol. 0-45= 99-59 



3. " " 4M5 S-63 50-76 320 « l-26=i:100 



4. Siegenite, Mo., 41-54 — 30-53 21-34 337 ** 1*07, Pb 0-39= 98-24 



In 2, the copper and iron indicate the presence of 6'42 p. c. of chalcopyrite, and in 

 3, 1049 p. c. These ores dissolve slowly in nitric acid without a separation of sulphur. 



Magnetite fp. 105]. — Professor JS'og'gerath has described a specimen of spathic 

 iron changed to magnetite (Bonn. Verb. d. Nat. Ver., 1866, p.lxxvii). It was from 

 Alte Birke near Siegen. 



]VlA!iGAniTE [p. 300], — Six-sided tables occur in tlie Pfitsch valley, Tyrol, accord- 

 ing to Girard (Zeitsch. f. ges. Nat., v, 301, in Kenngott's Forsch. for 1855). Analysis 

 by Faltin : 



Si *1 3Pe Ca Slg ^a ]S: F f[ 



29-57 52-63 1-61 10-79 0*64 0-74 0-44 0-13 3-20=99*75 



MARCYLrrE fSuppl. II]. — Tliis amorphous black copper ore described by Shepard 

 ' is apparently an impure atacamite. in an imperfect trial, Shepard obtained, Cop- 

 per 54-30, O and CI 36-20, fl 9*50; and the atacamite contains copper 59-Oj and 

 CI 283, Tvater I2'7.— J. d. d. 



Mica fp. 217, and I, II]. — The rose-colored mica of Goshen, Mass., has been ex- 

 amined by J. W. Mallet (this Jour., xxiii, 180), and found to contain less than one 



per cent of lithia. It afforded him. K 9*08, l^fa 099, Li 0-64. Calculating from 

 the loss, this mica gave 1-89 p. c. of fluorine. In the blowpipe trials of Prof. Silli- 

 n^an Jr., in 1848, he found little lithia, and on this authority the Mineralogy states 

 (p. 227), as observed by Prof. Mallet, that the mica might not be lepidolite. 



A Ve^uvian mica has been examined crystallogrnphically by Kokscharov (Min. 

 Ru9sl., ii, 126, 291). The crystals arc much like those of muscovite, being seem- 

 insrly oblique [nearly like fig. 409 Min. p. 221] with : /=:98° 38i^ and 0:e = 

 106*^ 53i'. But taking the form as trimetric, these lateral planes are planes of the 



octahedrons 2 and 1. Tliere is also the clinodome Ay, the faces inclined io P 114^ 

 29'. But Kokscharov shows that the planes ^^ and 1 have a simple axial ratio, 

 such that ^1:0 is the same angle as 0:1, or 106*^ 53^, [a necessary result in a 



