850 SMAKAGD. 



of commerce is manufactured. In this form 

 it is used for painting and colouring glass 

 and porcelain, and is the colour employed 

 in printing the common blue willow-pattern 

 earthenware, with which everybody is 

 familiar. It is also employed for imparting 

 a blue tint to paper and linen, and when 

 ground and washed, forms a cheap and 

 durable paint. The arsenic driven off in 

 roasting the ore is also condensed and 

 collected. 



Smaragd, Estner. \ See Emerald, 



Smaragdus, Wallerius. j and Beryl. 

 Smaragdit, Saussure. Smaragdite, 

 Phillips, Leymerie. A peculiar laminated 

 form of Augite or Hornblende, with a cleav- 

 age parallel to the sides, and diagonals of 

 a slightly rhombic prism. Colour bright 

 or emerald-green. Transparent at the 

 edges to opaque. Lustre silk}'- or pearly. 

 Yields to the knife. H. 5 to 6. S.G. 3. 



Analysis, by T. Sterry Hunt : 



Silica 54-30 



Alumina .... 4-54 



Lime 13-72 



Magnesia . . . .1901 



Soda 2-80 



Protoxide of iron . . S-87 



Oxide of chrome . .0 61 



Oxide of nickel . . . traces 

 Loss by ignition . . . 0-30 



99-15 



BB fuses to a grey or greenish enamel. 



Localities. Monte Rosa, and near Geneva, 

 in Switzerland. Corsica, in Felspar. 



Name. From (rfx,x^<x,yhos, emerald, in allusion 

 to its colour. 



Brit. Mus., Case 31. 



According to Hisinger ani De la Fosse, 

 Smaragdite consists of laminas of Pyroxene 

 and Hornblende, united in a more or less 

 regular manner. 



The Smaragdite, which occurs in the 

 Euphotide of the Swiss Alps, has been 

 lately examined by T. Sterry Hunt, who 

 pronounces it to be a Pyroxene containing 

 chrome and nickel, with some admixture tf 

 Saussurite, and probably also of Talc. See 

 analysis. 



Smaragdo-chalcit, Breithaupt. Eme- 

 rald Copper. See Dioptase. 



Smectite, Salvetat. A greenish kind of 

 Halloysite from Conde, near Houdan, in 

 France. 



Comp. A12 Si3 + 7iH. 



SMITHSONITE. 



nal//sis, by Salvetat : 





Silica . . . 



. 43-00 



Alumina 



. 32-50 



Gelatinous silica . 



. 1-50 



Jiime . 



. 1-02 



Protoxide of iron . 



. 1-02 



Magnesia 



. 0-30 



Potash and soda . 



. 0-40 



Water . 



. 21-70 



101-44 

 Smectite, Breithaupt. An Halloysite- 

 like substance from Cilly, in Lower Styria, 

 and Zeng, in Croatia. 



Analysis, by L. A. Jordan : 

 Silica . 

 Alumina 



Peroxide of iron . 

 Lime . 

 Magnesia 

 Water 



51-21 

 12-25 



2-07 



2-13 



4-89 



27-89 



100-44 

 Name. From criu^riy^rk^ smeared, on account 

 of its greasy feel. 



Smelite. (From iriJ^r^h, soap.) A greyish 

 white or bluish kind of Kaolin, found in 

 trachytic porphyry, near Telkebanya, in 

 Hungary. Lustre dull. Opaque. Fracture 

 conchoidal. May be worked in the lathe, 

 and takes a polish when rubbed. Adheres 

 slightly to the tongue, and feels unctuous to 

 the touch. H. 2-5. S.G. 2-168. 

 Analysis, by Oswald: 



Silica 50-0 



Alumina .... 32-0 



Peroxide of iron . . .2-0 



Soda 2-1 



Lime, magnesia and sulphuric 



acid traces 



Water 13-0 



99-1 



BB infusible. 



Scarcely acted on by boiling muriatic 

 acid. 



Smeraldo, La lletherie, Brochant. See 

 Emekald. 



Smikgel. a name for Corundum mixed 

 with Quartz and Magnetite; probably the 

 a-iJ.up? of the ancient Greeks. 



Smithsonite. Beudant, Dana, Haidinger, 

 V. Kobcll, Leymerie. See Calamine. 



SiMiTHSONiTE, Greg §- Lettsom. Rhombic : 

 commonly with hemihedral terminations. 

 Primary form a right rhombic prism. Oc- 

 curs in attached crystals ; also stalactitic, 

 botrj'oidal, granular, and compact. Colour- 



