4 



120 Fourth Supplement to Danas Mineralogy. 



Haerisite [Siippl. IIIJ. — K A. Pratt describes the mode of occurrence and char- 

 acters of this cubic copper glance in this Jour., xxiii, 409. 



Dr. F. A. Genth, in the same volume, p. 415, states reasons for supposing the 

 Harrisite to be a pseudonioiph after galena, and mentions an example of this species 

 of pseudoniorph described by Breithaupt in his Paragenesis as occurring in Saxony. 

 Dr. Genth obtained in his analyses: 



•S Se A^r Cu Pb Fe TnsoL 



20-648 midet, 0-207 '77-298 0-056 0-442 0-272=9S-923 

 20-647 0047 0-164 77*758 Q-OGO 0*359 0-G67=99-702 



Profl C. U. SheparJ sustains Harrisite as a species, in this volume, page 40. 



Hartite [p. 473]. — The figure given on page 473 for a crystal of this species be- 

 longs to Scheererite and was so published by Plaidinger. 



G. A. Kenngott has examined some microscopic tabular crystals of hartite obtained 

 from an alcoholic solution (Jahrb. k. k. GeoL Reichs., 1856, p. 91), and found the angle 

 of the plates about 99^° and 80^° ; the acute angle of the plates replaced, making 

 the base hexagonal; the angle this side forms "with the longer side of the hexagon 

 is ll7i°, with shorter 143*^. The hartite has been found in Brown coal at Rosenthal 

 near Koflach in Styria. The largest pieces arc three-fourths of an inch through. 

 Cleavage perfect in one direction. Haidinger describes the cleavage as perfect par- 

 allel to the base of the crystals. Grayish-white to colorless; vitreous lustre but 

 pearly on a cleavage surfixce. G.=1036, 1-054, 1*060 (three specimens) Kenngott, 

 1'041 Baumert. Fuses, according to Baumert, at 72=^ C. when pure. Melted on 

 paper it leaves a stain which is wholly dissipated with more heat. Composition, 

 according to Baumert, Carbon 87*77, hydrogen 12*26 (mean of results )=1 00*03, cor- 

 responding to the formula C^^H^::^ carbon 8^^7-80, hydrogen 12-20, the same that was 

 deduced by Schrotter for the hartite of Oberhart 



He:m.\tite [p. 11.3, 506, and II, III].— Pseudomorphs of hematite (specular iron) 

 after octahedrons of magnetite occur in granite near Schonbcrg, in Northern Mora- 

 via. They resemble Breitliaupt's Martite.—E. F. Glocker, Fogg., xcvi, 262. 



Hkssite or Telltjuic Silver [p. 44 and 506], — Kokscharov observes (Min. Russl., 

 ii, 183) that hessite occurs in fine, or rarely coarse, granular masses, with an even frac- 

 ture and no distinct cleavage. G.=8'565, Rose. It occurs with blende, copper and 

 iron pyrites, imd sometimes telluric lead. 



Telluret of silver has been found at Georgetown in California, according to W. P. 

 Blake (this Jour., [2], xxiii, 270). It resemble? silver glance, and is mixed with ga- 

 lena and native gold. The texture is compact and not granular. The blowpipe 

 trials of Mr. Bhike obtained telluric acid, and this result has been repeated by Prof, 

 G. J. Brush who obtains fur the specific gravity [communicated] S'33. It is not cer- 

 tain that the species is identical with hessite, although c^uite probable. 



Heulaxdite [p. 330], — Descloizeaiix confirms on optical grounds, the union of 

 heaumontite with heulandite. — L'Institut, No. 1207. 



Hornblende [p. 170, and I, II, III]. — A columnar or fibrou=^ mineral from Danne- 

 mora, described by A. Erdmann, has been named Banneynorlte by Kenngott (Min. 

 Forsch., 1855). T el lo wish-brown to greenish-gray. G.=3*516. B.B. becomes black 

 and fuses on the edges. Contains 



Si Si Ca Illg Mn t^ 



48-89 1-46 0-73 292 8-46 38*21 



Oxygen, 25-38 0-66 0'20 'l-14r 1-90 8*48 



It is nearly pure iron-hornblende. 



CrocidoUie occurs in the Minette of the Vosges (see under Mica beyond), accord- 

 ing to Delesse (L'Institut, iNo. 1216). It gave nim: 



Si Si f^e Mn Ca ]irg ^a ft ft a f 

 5302 trace 25*62 050 MO 10-14 5*69 039 2*52 0*41 017=99"56 

 Oxygen, 27-55 5*83 O'U 0-31 3*92 1*46 007 



giving the hornblende ratio for the oxygen of R and Si, 4 : 9. Crocidolite appears 

 therefore to be a hornblende. The African varietv contains more water. 



