348 SILVER MULM. 



Copper .... 1'53 



Lead 



3-68 



99-27 



BB or in the flame of a candle, the sulphur 

 is driven off with intumescence, and the 

 silver is reduced to its metallic state. 



Soluble in tolei'ably strong sulphuric acid, 

 with separation of sulphur. 



Localities. — English. Cornwall : at Huel 

 Herland, j^^. 387. Huel Ann, Dolcoath Mine, 

 Mexico Mine, Huel Duchy {earthy'), Huel 

 Vincent, Huel Basset. — Foreign. Siberia. 

 Kongsberg, in Norway. Joachimsthal, in 

 Bohemia. Schemnitz and Kremnitz, in 

 Hungar}^ Schneeberg, Annaberg, Johann- 

 georgenstadt, Freiberg, in Saxony. Dau- 

 phiny. Mexico. Peru. Tenessee, and Nor- 

 thern Michigan, United States. Lake Su- 

 perior. 



Brit. Mus., Case 10. 



M. P. G. Principal Floor, Wall-cases 14 

 (British) ; 22 (Foreign). 



Silver Glance constitutes a valuable ore 

 of silver. See also Silver Black. 



Silver Mulm. See Silver Black. 



SiLVERPHYLLINGLANZ. See SlLBEEPHYL- 



lestglanz. 

 Silver-white Cobalt. See Cobal- 



TINE. 



Silvery Chalk, Kirioan. See Apheite. 



SiNKANiTE, Croerning. A mechanical 

 mixture of Galena, Anglesite, and Sulphur, 

 from the lead mines of New Sinka, in Tran- 

 sylvania. It was first found afDufton, and 

 described by Johnston, and was subse- 

 quently named Johnstonite by Hai dinger. 

 See Johnstonite. 



SiNOPiTE, Hausmann. The Bole of 

 Sinope. 



SiNOPLE, Kirwan. A dark red kind of 

 Jasper, said to contain 18 per cent, of iron. 

 S.G. 2'691. It occurs with auriferous ores 

 at Schemnitz, in Hungary. 



SiSMONDiNE, Delesse. A foliated variety 

 of Chloritoid, of a dark greyish, or blackish- 

 green colour, occurring at St. Marcel, in 

 Piedmont, in chlorite-slate. Streak bright 

 greyish-green. Brittle. H. 5-5. S.G. 5-36. 



SLATE COAL. 

 Skogbolite. The name proposed by Nor- 

 denskioldfor the varieties of Tantalit found at 

 Skogbole, and Harkasaari, in Finland. See 

 Tammela-tantalite and Tantalite. 

 Skolecite. See Soolecite. 

 Skolopsite, v. Kohell. Occurs granular- 

 massive, with no traces of cleavage. Colour 

 greyish-white or reddish- grey. Translucent 

 in thin splinters. Rather brittle. Fracture 

 splintery. H. 5. S.G. 2-53. 

 Analysis, by v. Kohell; 



Silica 41-13 



Alumina .... 15-42 

 Protoperoxide of iron . . 2*49 

 Protoxide of manganese . 0-86 



Lime 15-48 



Magnesia .... 2*23 

 Potash .... 1-30 



Soda 10-06 



Sulphuric acid . . . 4*09 

 Sodalite . . . .7-78 



Si5Fe4 + 5AlH. 



Name. After Mons. A. de Sismonda, 

 Professor of Mineralogy at the University 

 of Turin. 



SissERSKiTE, .Haidinger. A name for a 

 variety of Iridosmine, 'derived from that of 

 a locality, Sissersk, in the Ural. It occurs 

 in six-sided scales of a steel-grey colour. 

 H. 7. S.G. 21-n. 



Skapolith, Werner. See Scapoltte. 



100-84 



BB swells up and fuses to a shining, 

 blebby, greenish-white glass. With borax 

 forms a colourless glass. 



Easily gelatinises in muriatic acid. 



Locality. Kaiserstuhl, in Breisgau. 



Skorodit, Breiihaupt. See ScoRODiTE. 



Skorza, See Scorza. 



Skutterudite, Haidinger. Cubical, with 

 a distinct cubic cleavage. Occurs crystal- 

 lized and massive granular. Colour between 

 tin-white and lead-grey, with an iridescent 

 tarnish sometimes. Lustre metallic. H. 6. 

 S.G. 6-74 to 6-84. 



Fig. 389. 



P' 



Comp. CoAs2 = cobalt 20-8, arsenic 79-2 = 

 100. 

 Analysis, of massive, from Skutterud t 



Arsenic 79-0 



Copper 19-0 



Iron 1"4 



99-9 



BB like Smaltine nearly. 



Locality.— Skutterud (whence the name 

 Skutterudite), near Modum, in Norway. 



Slaggy Mineral Pitch, Jameson. See 

 Asphalt. 



Slate Coal, Jameson. Coal with a slaty 

 structure, and an uneven small-grained 

 cross-fracture. The coal in the neighbour- 

 hood of Newcastle, and from Bolton to 



