SULPHURET OF LEAD, COPPER, AND ANTIMONY. 231 



brittle, and the fracture is of a grain very fine and 

 smooth. 



Thrown into cold nitric acid, it dissolves pretty readily, Action of nitric 

 and with effervescence. A real analysis is thus accomplished. a on "' 

 The sulphur swims on the liquid, which holds in solution 

 the copper and lead, and is of a green colour, and the oxide 

 of antimony is precipitated in the form of a blue powder 

 inclined to gray. 



The endellion analysed by Mr. Hatcheit gave for its Component 

 component parts sulphur 17, antimony 24*23, lead 42*62, P arls * 

 copper 12*8, iron 1*2: loss 2*15. 



Eventual characters. 



Phosphorescence. Placed on a hot iron the moment it Phosphore§- 

 begins to lose its red colour, the endellion diffuses a blue- cen ' 

 ish white phosphorescent light, the intensity of which ap- 

 peared to me to vary in different specimens. 



Table of the Endellion and its Varieties. 



Species. 

 Triple sulphuretof 



lead, copper, and 



antimony. 

 Endellion. 



Varieties. 

 Crystallized in a 

 perfectly deter- 

 minate manner. 



In the compact 

 state. 



Varjetit*. 



Primitive crystal. 



Its modifications 

 and varieties. 



Pure. 



Mixed irregulair 

 )y with sulphu- 

 ret of zinc. 



Mixed irregular- 

 ly with yellow 

 sulphuret of 

 copper and iron. 



Description of the different Varieties of the En- Description. 

 dellion. 



Of a determined crystalline form. 



The perfectly determined crystalline form is that in CrystaH'ot. 

 which this substance has hitherto most commonly occurred. 

 The surface of its crystals has a very shining lustre, which 

 can be better compared to nothing than to the rhomboidal 

 oxide of iron of the island of Elba, oligist iron of Hauy. 

 This lustre however is exceeded by that of their fiacture, 



whea 



