248 Professor Necker 07i Mineralogy considered 



sublimate of quicksilver, in small globules, without smoke or smell. 

 Geru — Amalgam (dodecaedral mercury, or native amalgam). 



Family 3. — Arsenideous. 



Brittle ; with the blowpipe in the open tube, and sometimes even in the 

 flame of a candle, or only by percussion, affording smoke, having the smell of 

 garlic. 



G^n.— Arsenic cobalt ( Weisser speiss kobalt, Werner). 



{Appendix.— AxsenicaX nickel (copper- nickel) ; arseniuret of iron). 



Family 4. — Stibideous. 



Brittle ; with the blowpipe in the open tube giving out white smoke, with 

 a pungent smell. This smoke, which covers the sides of the tube, may be 

 driven from one part of it to another, by the application of heat, and does not 

 leave any traces. 



Gen — Antimonial silver (with arsenical silver). 



{Appendix.— Antimonial nickel). 



Family 5. — Osmideous. 



Brittle ; with the blowpipe in the open tube affording neither sublimaJte 

 nor smoke, but only a pungent smell like chlorine. 

 Ge:i. — Iridosmine (alloy of iridium and osmium). 



Family 6. — Tellurideous. 



Brittle ; with the blowpipe in the open tube affording much smoke, which 

 adheres to the sides of the tube in the shape of a white dust, capable of being 

 fused and transformed, when heated, into transparent colourless drops. These 

 drops are sometimes microscopic. 



Gen. — Graphic tellurium {Schrifierz, W.) ; yellow tellurium ( Weiss si/loan- 

 erz, W.) 



{Appendix. — Molybdan silver of Klaproth ( Tellur wismuth^ Leonhard) ; Tel- 

 lur silver of Rose {Tellurium silver) ; telluret of lead, G. Hose. Native bis- 

 muth of Esmarck, or tellure selenie bismuthifert of Haiiy. 



Appendix to the Order Alloys. 



Family Selenideous. 



With the blowpipe in the open tube affording a red sublimate, accompanied 

 by a strong smell of rotten radishes. 



Seleniuret of copper ; eukairit or seleniuret of copper and silver ; seleniuret 

 of lead ; seleniuret of lead and cobalt ; seleniuret of lead and copper ; seleniu- 

 ret of lead and mercury ; seleniuret of silver Ag Se^ ; other seleniuret of sil- 

 ver Ag Se^. Other seleniuret of silver Ag Se, Pb. Se, Silber phylUn glcmz 

 of Breithaupt. Seleniuret of mercury {Selen quesksilber of Karsten ?). 



Order III.— PYRITES. 



Chem. Nat. — Metallic sulphurets. 



With the blowpipe in the open tube giving out the smell of sulphurous acid, 

 or turning moistened Brazil wood paper, white, introduced in the superior 



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