xcviii GENERAL SUMMARY OF SCIENTIFIC AND 



Chalcophanite is a new mineral from that most interesting 

 and prolific locality, the zinc mines at Stirling, N. J. It oc- 

 curs in small tabular crystals and crystalline masses, resem- 

 bling specular iron at first sight. In composition it is a hy- 

 drate of zinc and manganese, related to psilomelane. It 

 takes on a brass color on being heated, whence its name. It 

 was described by Dr. G. E. Moore in the July number of the 

 American Chemist. 



Chlorotile. A hydrous arseniate of copper, of a pale 

 green color. Found by Frenzel at Schneeberg, Saxony. 



Clarite. A supposed new sulphide of antimony and cop- 

 per, resembling enargite, from a mine in the Black Forest. 

 Described by Sandberger. 



Cossaite. A mineral near paragonite, from the mines of 

 Borgofranco, Italy. Described by Gastaldi. 



Frenzelite. A selenide of bismuth from Guanajuato, Mexi- 

 co. It occurs massive, with distinct cleavage; also in mi- 

 nute needle-like crystals. It has a bluish-black color, and 

 metallic lustre. It was first mentioned by Castillo, but since 

 then more completely described by Frenzel. 



Garnierite / Nomrieite. Liversidge, in the Journal of the 

 Chemical Society, has given these names to two hydrous sil- 

 icates of nickel and magnesia found in serpentine at Noumea, 

 in New Caledonia. Both minerals are distinguished by 

 their apple-green color; they are supposed to differ some- 

 what in composition, as also in physical characters. 



Hydrofranklinite. Another new mineral from the zinc 

 mines in New Jersey. It appears to be, like chalcophanite, a 

 hydrous oxide of zinc and manganese, but occurs in regular 

 octahedrons. It has been announced by Professor Roepper, 

 though not yet fully described. 



Ilydrocuprite. Hydrous oxide of copper; occurring in 

 orange-yellow coatings at Cornwall, Pa. Described by Dr. 

 Genth in the " Mineralogy of Pennsylvania " already alluded 

 to. 



Indianaite. A new porcelain clay from Lawrence County, 

 Indiana. Described by Professor Cox at the meeting of the 

 American Association at Detroit, in August. 



Koppite. A mineral closely related to pyrochlore; from 

 the Kaiserstuhlgebirge, Baden. 



Melanosiderite. This is a basic silicate of iron, related to 



