12 A Neva Mineraiogical Nomenclature, 



tinctncsl of the cleavages, t<> determine which one is the primary ; for 

 either of the forms in the class Triinetrica (for example) may have 

 the other three as secondaries. 



The peculiarities of cleavage have been expressed as follows: 



Acrotomus, faxgov summit, and c5/xvw to cut v[f) : cleavage parallel 

 to the base of a prism or octahedron, or to n plane truncating the 

 vertex of the rliomhohedron. 



Pcril<>mus. !>out, and t:/xv^;) : cleavage parallel with each of 



the lateral planes. 



Dialomus, (Sia through, and ts(xmu) : cleavage in the direction of a 

 diagonal plain . 



DystoMUS, ('hs difficult, and <r£/xvw) : cleavage difficultly obtained. 



Kutomus, (:j easily, and ts/avoj) : cleavage easily obtained. 



The names proposed for the Classes are I. Epigjea, ('£« 77)071, 

 and yaix earth) ; II. Entogjea, (Svtos within, and yam) ; III. Hypo- 

 ge;e, (uto beneath, and yam) : the first includes the fluids and those 

 soluble minerals whose formation is going on at the present time 

 from the decomposition of other species, and which therefore are 

 necessarily sujh rli rrancous; the second, the species which occur in 

 and compose rock-strata, and of which it is therefore appropriately 

 said that their native situation is within the earth; ihv third, those 

 which have been lite rally buried, as the coals nnd resins. 



The remaining terms will be explained as they arc employed. 



Classis I. EPIGiEA. 



G. uml. 1 3.^. No bituminous odor. Taste of solid individuals 

 acul, alkaline, oi saline. 



Claeeii II ENTOGiEA 

 f. ibovi 1 9 Ta i' I' 



Classis III HYPOG/EA 





