Prof. Chapman on the Classification of Minerals. 179 



5. Nickeline Type : — Hexagonal. 



Nickeline Ni 2 As; breithauptite Ni 2 Sb; millerite NiS. (Ap- 

 pendix; eisen-nickelkies.) 



6. Pyrrhotine Type: — Hexagonal. 



Pyrrhotine 5FeS + Fe 2 S 3 ? This species should perhaps be 

 placed under the preceding type. 



7. Linnceite Type: — Monometric. 



Linnseite (Ni, Co, Fe)S + (Ni,Co,Fe) 2 S 3 ; skutterudite Co 2 As 3 ; 

 (amoibite; griinauite). 



8. Marcasite Type: — Trimetric. 



Chloanthite, NiAs; mohsine* FeAs 2 ? (orR 4 As 3 ); glaucodot 

 (Co, Fe), S 2 + (Co, Fe), As ; mispickel FeS 2 + FeAs, or with part 

 of the Fe replaced by Co (danaite) ; marcasite Fe S 2 . 



The linear arrangement breaks, in a degree, the relations ex- 

 isting between the members of this, and those of the following 

 type. The two should be taken in parallel order. 



9. Pyrites Type: — Monometric. 



Hartmannite (ullmannite) Ni S 2 + Ni (Sb, As) ; disomosef 

 Ni S 2 + Ni As; rammelsbergite NiAs; smaltine Co As; cobaltine 

 CoS 2 + CoAs; pyrites FeS 2 . 



III. Blendes. 



1. Hauerite Type: — Monometric. 

 Hauerite ZnS 2 (isomorphous with pyrites). 



2. Blende Type: — Monometric. 



Blende ZnS ; voltzine 4ZnS + ZnO ; alabandine MnS. This 

 type is related both to the pyrites type of the preceding family, 

 and to the galena type of the Glances ; but more strongly to the 

 former. 



3. Greenockite Type : — Hexagonal. 



Greenockite CdS. 



IV. Glances. 



1. Chalkosine Type :■— Trimetric (D :D about 120°). 

 Discrase (Antimonsilber) Ag 4 Sb; sternbergite AgS + 2Fe 2 S 3 ?; 



* Mohsine, Chapman 1843. Subsequently named leucopyrite by Dana, 

 and lolingite by Haidinger. The mineral was first distinguished by Mohs. 



t Disomose, Beudant 1830. Subsequently named gersdorffite by Hai- 

 dinger. 



N2 



