Third Supplement to Bands Mineralogy. 261 



Stibnite or Stibine (Antimony Glance) [p. 33]. — -Occurs in Katharinenburg in the 

 Urals. Kokscharov, Min. Russl. ii, 163. 



Sttlbite [p. 332]. — A mineral related to Stilbite has been described by J. W. 

 Mallet (this Journ. xxii, 179). Coarse granular massive, grains cleavable, pearly on 

 two opposite faces, monoclinic?, hardness a little above that of calcite, G.=2 252. 

 With strong muriatic acid yields a jelly. Composition — 



Si £1 Ca % K, little Na fl 



53-95 20-13 12-86 trace 087 12-42=100-23 



corresponding nearly to Ca Si -f- ^1 Si 2 + 3^H. — From the Isle of Skye, Scotland. 



Stilpnomelane fp. 287]. — Observed by E. F. Glocker, in Moravia and Eastern 

 Silesia, at Seitendorf near Troppau, Barn, two miles from Sternberg in Moravia, at 

 Sternberg, and at Liskowitz and Wachtersdorf, and Jessenetz. The rock containing 

 it is clay slate or argillite, probably of Devonian age. It is often associated with 

 chlorite, calcite, and magnetite, and sometimes with pyrites and limonite. Chlorite 

 especially is its common attendant, and the two have close resemblances, so that 

 when mixed they are distinguished with some difficulty. 



Tantaltte Tp. 351], — Tantalite from Chanteloube in Limoges, has given Dr. G. 

 Jenzsch the following composition (Pogg. xcvii, 104): 



Ta 2r Sn Fe ifrn 



1. 83 55 1 54 1-02 14-48 tr. = 100-59 G. = 7'703 



2. 7898 5-72 236 £e!3-62 tr. = 100 68 G. = 7-027—7 042 



The second analysis is of specimens partially altered by exposure. The fresh pieces 

 have a conchoidal fracture, submetallic adamantine lustra. H. = 6 5, streak iron- 

 black to blackish-brown. The specimens analyzed had been received by H. Rose 

 from M. Damour. 



Thenarditr [p. 365]. — Scacchi has described (loc. cit.) an anhydrous sulphate of 

 soda under the name of pyrofechnite, (alluding to its volcanic origin) found on the 

 scoria of the eruption at Vesuvius of 1855. On being dissolved and evaporated, 

 octahedral trimetric crystals were obtained. Calling the planes of the octahedron 1, 

 the planes are 7, U, 1, 33 ; and the angles 7: 7 = 118° 37', 11 : li (over base) 128° 

 58', 1 : 1, basal, = 135° 21', pyramidal 123° 39' and 74° 36', 3 3 : 3 3 basal. = 153° 

 41', pyramidal 63° 48' and 123° 2'. [The planes and angles are those of The- 

 nardite, a described octahedron of which has the angles, 135° 41, 123° 43' and 

 74° 1 8'. See Brooke and Miller's Min., p. 534. The angles in the author's Min., are 

 from Hausmann. — j. d. d.] 



Trttomtte fp. 311]. — According to Dr. D. Forbes, the crystallization of tritomite 

 is doubtful (Edinb. N. Ph. J., [21, iii, Jan. 1856). G. = 3-908. Composition accord- 

 ing to his analysis : 



Si W(withSn)&l Ca % ffe Y La £e Fe En fi 

 21-16 395 2-86 4-04 009 033 464 12 41 37"64 2 68 1-10 8-68=99-58 



Dr. Forbes states that the received formula R- Si 2fl is probably as correct as any 

 other which can at present be proposed. 



Tscheffkinite fp. 3411. — Description by Kokscharov in Min. Russl. ii, 150. He 

 states that he knows of five specimens of the mineral, and that most of the so-called 

 Tscheffkinite is Ural-orthite. 



Tvrite [Suppl. i].— This species, described by D. Forbes, is referred to Ferguson- 

 ite by A. Kenngott (Pogg. xcvii, 622). His specimens were received from Dr. Bondi 

 of Dresden, who suggested on sending them a possible relation to that species. 

 They were from Helle and Tromsoe near Arendal. One of them is a portion of a 

 crystal sufficient to establish its hemihedral dimetric character and a correspondence 

 in the occurring planes, these planes being 0,1, 3^. [figure in Min., p. 350], and giving, 

 as nearly as can be determined, the same angles. Haidinger describes Fergusonite as 



