754 



Atelite. 



Tallingite. 



Footeite. 



REPORT OF NATIONAL MUSEUM, 1897. 

 a roup 5. 



Cll;,(0H)4Cl..H:0. 



Cu5(OH)«C1..4H:0. 

 Cu,,(OH),60L.4H,(). 



(?) 

 (?) 

 Mouorliui( 



B. COMPOUNDS OF SULPHUR, SELENIUM, AND TELLURIUM; ALSO 

 ARSENIC, ANTIMONY, AND BISMUTH. 



This division includes the non oxidized compounds of suli)hur, sele- 

 nium, and tellurium ; also arsenic, antimony, and bismuth. It embraces 

 the sulphides, selenides, and tellurides of the elements; also the arse- 

 nides, antiraonides, and bismuthides, the sulpharsenides, sulphanti- 

 monides, and sulphbismuthides, and the sulphosalts. 



SULPHIDES, SELENIDES, AND TELLURIDES. 



The elements sulphur, selenium, and tellurium bear a marked resem- 

 blance to one another and present close analogies in their properties, 

 occurrence, and mode of combining with other elements. The terms 

 sulphide, selenide, and telluride include all those compounds, derivatives 

 of H2S, H2Se, and HiTe, in which sulphur, selenium, or tellurium forms 

 the sole or chief negative part. The three negative elements are essen- 

 tially isomori)hous and may replace one another in varying amounts. 



CLASS, — SULPHIDES. 



Realgar. 



Orpiment. 



Dimorphite. 

 Stibnite. 



Metastibnite. 

 Bismutbinite. 



Molybdenite. 



Oldhamite. 

 Sphalerite. 



IMarinatite. 



Przibrainite. 

 Wurtzite. 

 Erytbroziucite. 

 Greeuockite. 

 Alabaudite. 

 Troilite. 

 Folgerite. 

 Millerite. 



