74 T. STERRY HUNT : SUPPLEMENT TO 
melilite, humboldtilite, gehlenite, sarcolite, milarite and barylite, which may well con- 
stitute a cognate genus. It is only by a binominal nomenclature, such as is employed in 
other departments of natural history, and has been so often essayed in mineralogy, that 
generic and specific relations, like those just pointed out, can be properly indicated. 
Such a nomenclature, in the Latin language, in connection with the system of classifica- 
tion proposed in this, and in the paper to which it is a supplement, would, it is believed, 
Tagze XI. — PErPHYLLoOIDS. 

SI'ECIES. FORMULA, © |) 1) | V x 

| 
Pholerite . . » [(Lsi;)o; + 2aq a LA 25 2.51 | 5.67 O. 
Talcosite nu (alsi)ons + Laqu.….0,,115:38 2.50 | 6.13} ? 




Kaolinite . . - [Gsis)o; +2aq . . . 11433 | 2.65 | 5.44| O. 
Pyrophyllite . .(alsi)o; aq . . .|15.00 | 2.80/ 5.35| O. 
0. 


Pyrophyllite . .|(aksi)o;+3%aq . . .|15.00 2.92 | 5.13 

give to mineralogy a form and a completeness, the want of which has been a great 
hindrance to its study. The preparation of such a nomenclature by the present writer is 
now well advanced. 
§ 13. We have sought, in the essay on “ A Natural System in Mineralogy,” and in the 
earlier papers cited therein, to lay the basis of such a system by showing how the differ- 
ences in hardness and in specific gravity of mineral species—the first data in the natural- 
Taste XIII. — ARGILLOIDS. 





| 
SPECIES. | FORMULA. Pp D | Vv | 
a | 
Schrotterite. - - | (al,si,Jo; +5aq - - | 12.80) 2.15 | 5.95 
Collyrite. - - - | (alisi,jo,+43aq_ - | 12.53 | 2.15) 5.83 
Allophane. - - | (aljsi,o;+Gaq- - | 12.27] 1.89 | 6.49 
| Samoite. - - - | (al,si;)o; + 5aq- - | 12.81} 1.89 | 6.66 
Halloysite. - -|(alssi,)o; +3aq- - | 13.80 | 2.40 | 5.75 
Kaolin.- - - -/|(alssi,)o; t2aq- - | 14.33 
Keramite.- - -|(alsi,)o, +2aq- - |13.85 |... 
Wolchonskoite. - | (er,si;)o, + 3aq- - | 15.33 | 2.30 | 6.66 
Montmorillonite. | (al,si,)o, +2aq - - |13.00 | 2.04! 6.37 
Chloropal.- - = | (fisi,Jos+Igaq - |15.51/ 2.10 | 7.38 
Cimolite. - - - | (al,si,jo,+laq- - |14.20 | 2.30 | 6.17 
Smectite. - - - |(alisi,)o; + 4aq- - | 12.55 | 2.10.) 5.97 



history method of Werner, Mohs and Jameson—are intimately connected with and 
dependent upon greater or less complexity of chemical constitution. The arbitrary and 
imperfect chemical method of Berzelius and his modern followers is thus superseded, and a 
new chemistry is made the foundation of a natural system of mineralogy, in which the 
natural-historical and the chemical methods are united and harmonized. The crystallo- 
