SCHWARZGULTIGEEZ. 

 Grey Copper ("see Tetrahedrite), con- 

 taining little or no arsenic. They occnr at 

 Clansthal, in theHarz ; Kamsdorf and Frei- 

 berg, in Saxony; Angina, in Tuscany; 

 Dnrango, in iMexico, &c. 



ScHWAKZGiJLTiGERZ, V. Leonhard, The 

 name applied to the compact and massive 

 variety of brittle sulphide of silver. See 

 Stephanite. 



ScHWARZKOHLE. Common Coal. See 

 Coal. 



ScHWARZMANGANERZ, V. Leonhard. See 



PSILOMELANE. 



ScHWARZSPiESSGLASEEZ, Werner. See 



BOUENONITE. 



SCHWATZITE, Kenngott. See Sci-IWARTZ- 

 ERZ. 



ScHWEFEL. German for Sulphur. Pro- 

 bably derived from the Arabic Schail, i. e. 

 lightning. 



SCHWEFEL m^D KOHLENSAUKES BLEI. 



See Lanarkite. 



SCHWEFEL UND KoHLENSAURES BLEI 



UND KuPFER. See Caledonitb. 



SCHWEFELANTIMONBLEI. See BOULAN- 

 GERITE. 



ScHWEFELKiES, Werner. See Pyrites. 

 ScnwEFELKOBALT, Berzelius. See Lin- 



N^ITE. 



ScHWEFELKOHLE. Friable pulverulent 

 Lignite, impregnated with Pyrites, found in 

 Picardy. (See Cendres Noikes.) It has 

 been used Avith success to preserve timber, 

 more especially that employed in railway 

 constructions. 



Schwefelnickel, v. Leonhard. See 



MiLLERITE. 



ScHWEFELSaURES BLEI UND KuPFER, 



V. Leonhard. See Linarite. 



SCHWEFELSILBER UND AlJiTIMON,U. ieon- 



hard. See Freieslebenite. 



ScHWER Spatit, Werner. See Barytes. 

 ScHWERBLEiERZ, Breithavpt. See Platt- 



NERITE. 



ScHWERSTEiN, Werner. See Scheelite. 



ScHwiMMKiESEL, ) See Float- 



ScHWiaiMSTEiN, Werner, j stone. 



ScLERETiNiTE, J. W. Mallet. A mineral 

 resin, occurring in small. round and oviform 

 drops, varying in size from a pea to a hazel- 

 nut. Colour black. Translucent in thin 

 splinters ; reddish-brown by transmitted 

 light. Lustre brilliant, vitreo - resinous. 

 Streak cinnamon -brown. Gives out a slight- 

 ly resinous odour when pulverised. Brittle. 

 Fracture conchoidal. H. 3. S.G. 1*136. 



Comp. CIO H7 O. 



Analysis, by J. W. Ilallet : 

 Carbon .... 77-15 



SCOLECITE. 





Hydrogen . 



Oxygen 



Ash ... . 



. 9-05 

 . 10-12 

 . 368 



100-00 



BB on platinum foil, swells up, burns 

 (like pitch) with a disagreeable smell and 

 smoky flame, leaving a coal rather difHcult 

 to burn, and finally a little grey ash. 



Insoluble in water, ether, alcohol, caustic 

 alkalies or dilute acids. Slowly acted on by 

 strong nitric acid. 



Locality. The coal-measures of Wigan, in 

 Lancashire. 



Name. From iry,Xy,^a?, hard, and py.rUy;, 

 resin, because of its hardness, Avhich exceeds 

 considerably that of other minerals of the 

 same class. 



Scleretinite more nearly approaches Am- 

 ber (C40 H52 0*) in composition than any 

 other fossil resin. 



ScoLECiTE, Dana. Scolezite, Fnchs, 

 Beiidant, Greg §' Lcttsom. Oblique. Occurs 

 in long or short prismatic or acicular crys- 

 tals ; very often in twins : also massive, 

 with a fibrous and radiating structure. 

 Colourless ; snow-white, greyish, yellowish 

 and reddish. Transparent to translucent at 

 the edges. Lustre vitreous ; of fibrous va- 

 rieties silky. Brittle. Fracture uneven. 

 Pyro-electric. H. 5 to 5-5. S.G. 22 to 2-7. 



376. 



Comp. Ca Si + Al Si-f3H = silica 46-64, 

 alumina 25*78, lime 14-04, water 13-54 = 

 100-00. 



Analysis, from Staffa, by Fuchs §- Gehlen : 



Silica 46-75 



Alumina . . . _ . 24 82 



Lime 14-20 



Soda 0-39 



Water 13 64 



99-80 



BB twists and curls up at first in a ver- 

 micular shape, and then fuses readily to a 

 blistered glass. 



With muriatic acid behaves like Sodalite : 

 dissolves in oxalic acid, with separation of 

 oxalate of lime. 



Localities. — Scotch. Stafi'a, in Argyle- 

 shire, in delicate white fibrous tufts, in trap 

 rock and basalt. Kear Loch Screden, iu 

 z2 



