180 Prof. Chapman on the Classification of Minerals. 



chalkosine* Cu 2 S ; berzeline Cu 2 Se ; stromeyerine Cu 2 S + AgS ; 

 eukairite Cu 2 Se + Ag Se. 



2. Covelline Type: — Hexagonal 

 Covelline CuS ; (riolite Ag Se 2 ) ? 



3. Molybdenite Type: — Hexagonal. 

 Molybdenite Mo S 2 . 



4. Elasmose Type; — Dimetric. 

 Elasmosef Pb, Au, Te, S. 



5. Sylvanite Type: — Trimetric. 

 Sylvanite, Ag, Au, Te. 



6. Galena Type: — Monometric. 



Argyrose AgS; naumannite AgSe; galena PbS; cupro- 

 plumbiteCu'S + 2PbS; clausthallitePbSe; zorgite (Pb,Cu 2 ), Se; 

 lerbachite, Pb Se, HgSe; onofrite HgS, HgSe; hessite AgTe; 

 petzite (Ag, Au) Te ; altaite Pb Te. 



Argyroids. 

 Monometric. 

 Native lead; mercury; amalgam (AgHg); silver; gold. 



VI. Platinoids. 

 Monometric and Hemi-hexagonal. 



Native platinum; palladium; platinum-iridium ; osmium- 

 iridium. 



VII. Arsenoids. 



Hemi-hexagonal. 

 Native bismuth ; arsenic; antimony; tellurium; tetradymite 

 (Bi,Te). 



VIII. Antimony Glances. 

 1. Stibine Type: — Trimetric. 

 StibineJ SbS 3 ; bismuthine, BiS 3 . 



* Chalkosine, Beudant 1830; redruthite, Miller 1852. 



t Elasmose, Beudant 1830; nagyagite, Haidinger. 



% Stibine, Beudant 1830. Haidinger's subsequent name of antimonite 

 is altogether inadmissible, as this is the generic appellation for an entire 

 class of chemical compounds — combinations of antimonious acid with bases. 

 The names bestowed by this eminent mineralogist on many other minerals 

 are unfortunately, open to a similar objection. 



