See Ep- 



f" SOMITE. 



SEL AMMONIAC. 



Sel Ammoniac, Rome "j 

 de Lisle. f See Sal Am- 



Sel Ammoniaque, Tmoniac. 

 Brochant. J 



Sel Capillairb, Brochant. See Hair 

 Salt. 



Sel d'Angleterre, Eoine de') 

 Lisle. I 



Sel d'Epsom, Boine de Lisle. 



Sel d'Epsom Natif, Bro , 

 chant. J 



Sel de Glauber, Brochant, Rome de 

 Lisle. See Glauber Salt. 



Sel de Sedlitz, Borne de TAsle. See 

 Epsomite. 



Sel Marin, Rome de Lisle. See Eock 

 Salt. 



Seladonite. See Green Earth. 



Selbite, Haidinger. A massive mineral, 

 probably only a mechanical mixture, but 

 considered by Hausmann to be identical 

 with the Plata Azul of Mexican miners. 

 It is of an ash-grey to a black colour, and 

 very soft. 



Analysis, by Selb : 



■ Silver 72-5 



Carbonic acid . . . 12-0 



Carbonate of antimony with 

 oxide of copper . . .15-5 



100-0 



BB easily reduced. 



Localities. Altwolfach, in Baden. Mexico, 



Name. In compliment to Selb, by whom 

 it was analysed. 



M.P.G. Wall -case 14 on principal floor. 



Selenblei, H. Rose. Selenide of lead. 

 See Clausthalite. 



Selenbleikupper. Selenide of lead 

 and copper ; a variety of Clausthalite found 

 in small fragments. Colour on a recent 

 fracture between lead-grey and violet, or 

 perfectlv violet. Very soft. Somewhat 

 malleable. S.G. 5-6. 



Comp. PbSe + CuSe. 



Analysis, from Tilkerode, by H. Rose ; 



Lead 47-43 



Selenium .... 34-26 

 Copper .... 15-15 



Silver . . . . . 1-29 

 Peroxide of iron and lead . 2-08 



100-21 



BB like Selenkupferblei, but fuses with 

 greater facility. See Selenkupferblel 



Selenbleispath, Kersten. See Sele- 

 nate of Lead. 



SELENITE. 341 



Selkncobaltlead, Nicol. See Tilker- 



ODITE. 



Selencopperlead, Nicol. See Selen- 

 kupferblei. 



Selencoppersilver. See Selbnkup- 

 fersilber. 



Sklen Cuprite, Shepard. See Berze- 



LIANITE. 



Selenic Silver. See Naumannite. 

 Selenic Sulphur. See Selensulphur. 

 Selenide op Copper. See Berzeli- 



ANITE. 



Selenide of Lead. See Clausthal- 

 ite. 



Selenide of Mercuhy. See Onofrite. 



Selenide of Mercury and Lead. See 

 Lehrbrachite. 



Sklenibt of Lead. See Clausthalite. 



Selenite, Jameson, Brochant. The name 

 generally applied to tbe transparent varieties 

 of Gypsum. Occurs generally in fiattish 

 crystals, the primary form of which is a 

 right oblique angled prism. Cleaves with 

 ease and brilliancy into thin laminae, which 

 are flexible but not elastic. Colour white, 

 or various shades of yellow, grey, red, 

 brown and violet. Lustre shining, some- 

 times pearly. More or less transparent. 

 Yields to the nail. Streak white. H. 1*5 

 to 2. S.G. 2-28 to 2-33. 



Fig. 37 



Fig. 380 



Fig. 379. 



Fig. 381. 



Comp. Hydrated sulphate of lime, or 



Ca S + 2H = lime 32-56, sulphuric acid 46 -51, 

 water 20-93 = 100. 



BB becomes white and opaque, and fuses 

 with difHculty to a white enamel. 



Does not effervesce with acids, when pure. 



Localities. — English. In the London Clay of 

 London and Surrey ; the Isle of Sheppey ; of 

 Walton- on-the Naze, in Essex. The Eocene 

 clays of the Isle of Wight, at Alum Bay, and on 

 the north coast between Newton and Cowes. 

 Shotover Hill, Oxfordshire, in clay, in large 

 transparent greyish-white crystals. Jigs. 

 379 to 881. Nevvhav'en, in flattish crys- 

 tals, 6 to 8 inches long. Telsibrd, Wilts. 

 z3 



