STEPHANITE. 

 Analysis, by Thomson : 



Silica 48-47 



Alumina > . . . 5-30 



Lime 30-96 



Protoxide of iron . .3-53 

 Magnesia .... 5-58 

 Water 6-11 



99-95 

 The green variety of Natrolite, found at 

 Bowling, in Dumbartonshire, is sometimes 

 sold as Stellite. 



Name. From stella, a star ; on account of 

 the star-like form of the crystals. 



Stephanite, Dana, Haidinger, Nicol. 

 Rhombic: primary form a right rhombic 

 prism. Occurs in short, prismatic, or in 

 thick tabular crystals frequently in macles ; 

 also massive, disseminated, and compact. 

 Colour dark lead-grey passing into iron- 

 black. Lustre shining-metallic. Colour of 

 powder dark grey or brownish. Structure 

 lamellar. Soft. Sec tile. Brittle. Fracture 

 conchoidal. H. 2 to 2-5. S.G. 6-27. 



Fig. 411. Fig. 412. 



Comp. Sulphide of silver and antimony, 

 or AgS + Sb^S^ = silver 70-4, antimony 14-0, 

 sulphur 15-6 = 100. 

 Analysis, from Schemnitz, by H. Rose : 



Silver 68-54 



Antimony .... 14-68 

 Sulphur .... 16-42 

 Copper 0-64 



100-28 



BB gives off fumes of sulphur, antimony, 

 and arsenic, and fuses to a dark metallic 

 globule, Avhich may be reduced on the ad- 

 dition of soda. 



Soluble in heated dilute nitric acid, with 

 deposition of sulphur and oxide of antimony. 



Localities. Freiberg, Schneeberg, and 

 Johanngeorgenstadt, in Saxonv, associated 

 with other ores of silver. Praibram and 

 liatieborzitz, in Bohemia. Kremnitz and 

 Schemnitz, in Hungary. Andreasberg, in the 

 Harz. Mexico. Peru. Siberia. 



Name. After the Archduke Stephan, of 

 Austria. 



Brit. Mus., Case 11. 



Stephanite is a valuable ore of silver. 

 ft occurs principally in veins in the older 

 rocks. See also Schwarz-gultigerz, and 



VVEISS-GiJLTIGERZ. 



STERNBERGITE. 361 



Stephensonite. The name proposed by 

 Prof. C. U. Shepard for a " hydro-sulphato- 

 carbonate of copper, of a chrysoprase-green 

 colour," met with at the Ducktown Copper 

 mine, in Eastern Tenessee. 



Stekcorite, Ilerapath. Occurs in crys- 

 talline masses and nodules in guano. Colour 

 white, with light yellowish- brown stains. 

 Transparent. Lustre vitreous. Very fragile. 

 Soluble in hot and cold water. S.G. 1-615. 



Comp. NaAmP + 9H 



Analysis, by T. J. Ilerapath ; 

 Crystallized ammonio-phos- 



phate of soda . . . 91*66 

 Phosphate of lime . . 2-10 

 Organic matters . . 1-96 



Carbonate of lime . . 28 



Carbonate of magnesia . traces 

 Phosphate of potash . . traces 

 Chloride of sodium " . . 0-52 

 Silica, sand, &c. . . 2-15 . 



Water and loss . . .1-33 



100-00 



BB swells up, blackens, gives off -water 

 and ammonia, and then fuses to a transparent 

 colourless glass, which is readily dissolved 

 in boiling water. 



Easily soluble, both in hot and cold water. 



Locality. Ichaboe, on the western coast 

 of Africa, 



Name. From stercoro, to dung or manure 

 land. 



Stercus Diaboli. a name for Dysodile, 

 in allusion to the bad odour it gives off in 

 burning. 



Sternbergite, Haidinger, Nicol, Phillips. 

 Rhombic, primary form a rhombic octa- 

 hedron. Generally occurs in implanted 

 crystals attached to the matrix laterally, so 

 as to form rose-like or fan-like aggregations. 

 Sometimes in macles. Perfect basal cleavage. 

 Also massive. Colour pinchbeck-brown, 

 with a violet-blue tarnish. Opaque. Lustre 

 of broad faces bright metallic. Streak black. 

 Flexible in thin laminae, which after being 

 bent may be smoothed down again with the 

 nail, like tin-foil. Very sectile. Leaves 

 marks on paper like black-lead, Avhich may 

 be removed by means of india-rubber. H. 1 

 to 1-5 S.G. 4-215. 



Comp. Sulphide of silver and iron, or 

 AgS + 2Fe2S5 = iron 35-44, silver 34-18, sul- 

 phur 30-38=100. 



Analysis, from Joachimsthal, by Zippe : 

 Iron ..... 36-0 



Silver 33-2 



Sulphur. .... 30-0 



99-2 



