345 



SIDEEOCHALCIT. 



formula, Mg C + 2Fe C = carbonate of mag- 

 nesia 26*58, carbonate of iron 73'42 = 10(). 

 S.G. 3-616 to 3-66. 



Analysis, by Fritzsche : 



Carbonic acid . . .41*93 

 Protoxide of iron . . 45*06 

 Magaesia .... 12*16 



9915 

 Localities. — ■ Pohl, an island in the 

 Baltic. Bolimsdorf, near Schleitz, in Upper 

 Saxony. Traversella, in Piedmont. 



Name. From erih,^o;, iron, and ^M(r'io;, a 

 iieighhour. 



SiDEKOCHALCiT, Breithuupt. See Apiia- 



KESITE. 



SiDEROSCHisoLlTE, TFemekinck, Phillips. 

 Occurs in small, six-sided, black prisms, 

 •ndiich are often grouped hemispherically. 

 Basal cleavage perfect. Lustre brilliant. 

 Opaque. Streak green, or greenish-grey. 

 H. 2*5. S.G. 3. 



Camp. Fe6 Si + H. 



Analysis, by Wernekinck : 

 Silica . . . . 

 Protoperoxide of iron . 

 Alumiaa 

 Water . . . . 



16*3 



75*5 



4*1 



7*3 



103*2 



BB fuses readily to a black magnetic 

 glass. 



Soluble in muriatic acid, Avith the forma- 

 tion of a jelly of silica. 



Locality. — Conghonas do Campo,in Brazil, 

 in cavities in iron ores. 



Name. From (ri'^'^40;, iron, (rx'o'ro;^ cleavahle, 

 and A/Oo?, stone. 



Brit. Mus,, Case 26. 



SiDEROSE, Beudant. (From o-i^v^o?, iron.) 

 Sparry iron. See Chalybite. 



SiDEROTANTAL. See Tantalite. 



Siegelerde. Seal Earth. See Sphra- 



GIDE. 



Siegenite. a name for Cobalt Pyrites, 

 after the locality, Siegen, where it occurs. 

 See Linn.eite. 



SiLBER-UND-ANTIMON. See FrEIESLB- 

 BENITE. 



SiLBERBLENDE, BreitJiaupt. Eed silver. 

 See Pyrargyrite. 



SiLBERFAHLERZ. Those Varieties of Tetra- 

 hedrite in which part of the copper is re-^ 

 placed by silver. 



SiLBBUGLANZ, V. Leonhard. See Silver 

 Glance. 



Silbbrhornerz. See Kerargyrite. 



Silberkupb'ERGLANz, Stromeyer. Cu- 



SILICEOUS SINTEE. 



preous sulphide of Silver. See Stromeyer- 



ITE. 



SiLBERMULM. An earth}' Variety of Silver 

 Glance, of a dark bluish-black colour, found 

 in several of the mines in Saxon3\ See 

 Silver-black. 



SiLBERPHYLLiXGLANz, BreitJiaupt. Ac- 

 cording to Plattner, it is a mixture of Selen- 

 silver and Selenmolybdena, containing a 

 small quantity of gold. It occurs in dark 

 grey foliated masses, with a perfect cleavage 

 in one direction, at Deutsch - Pilsen, in 

 Hungary, in gneiss. . H. 1 to 2. S.G. 6*8 

 to 5*9. 



SiLBERSCHWARZ, Estner, Eeuss, Werner. 

 or SiLBERSCHWARZE, Black Silver. See 

 SiLBEKMULM and Silver-black. 



SiLBBR-spiESSGLANz, Huusmunn. See 



DiSCRASITB. 



Silberwismuthglanz Silver-bismuth- 

 glance. See Bismuth Silver. 



SiLEx NECTiQUE. See Floatstone. 

 Silicate of Bismuth, Thomson. See 



EULYTINE. 



Silicate of Cerium, Wolldston, Phillips. 

 See Cerite. 



Silicate of Iron, Thomson, Phillips. 

 See Fayalite. 



Silicate of Manganese, Allan. See 

 Rhodonite. 



Silicate of Yttria, of a brown colour, 

 'according to Damour, is found in the dia- 

 mond-sands of Bahia in Brazil. H. 5 to 6. 

 S G. 4*391. 



Silicate of Zinc. See Mancinite, 

 Smithsonite, Willemite. 



SiLicE Fluatee alumineuse, Haily. 

 See Topaz. 



SiLicE gelatineuse. See Randanite. 



Siliceous Borate of Lime. See Da- 



THOLITE. 



Siliceous Calamine, L. Gmelin. See 

 Smithsonite. 



Siliceous Hydrate of Magnesia, 

 Thomson. See Nemalite. 



Siliceous Oxide of Zinc, Phillips. See 

 Smithsonite. This name has also been 

 applied by some authors to Willemite. 



Siliceous Sinter. Amorphous silica 

 deposited in the state of light cellular Quartz, 

 or as opaline silica, by the waters of hot 

 springs, whose solvent powers are due to 

 their temperature and the presence of a 

 small quantity of alkali. Silica is held in 

 solution in the Geysers of Iceland and New 

 Zealand, and traces of it are also present in 

 ordinary waters as alkaline silicates. (See 

 also Pearl Sinter or Fiobite.) The 

 siliceous sinter deposited from the hot 



