12 A Nciv Mwieralogical Nomenclature. 



tinctness of the cleavages, to determine which one is the primary ; for 

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

 the other three as secondaries. 



The peculiarities of cleavage have been expressed as follows : 



Acrotomus, ('ax^ov summit, and ts/jwcj to cut off) : cleavage parallel 

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

 vertex of the rhombohedron. 



Peritonitis, (tfsji about, and ts\imu) : cleavage parallel with each of 

 the lateral planes. 



Diatomus, (5ia through, and ts(/,vw) : cleavage in the direction of a 

 diagonal plane. 



Dyslomus, (Svs difficult, and ts/xvw) : cleavage difficultly obtained. 



Eutomus, (su easily, and <r£(M>w) : cleavage easily obtained. 



The names proposed for the Classes arc I. Epigjea, ('eiri upon, 

 and yaia earth) ; II. Entogjea, (svtos xvilhin, and yaia) ; III. Hypo- 

 oeje, (utfo beneath, and yaia) : 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 superleiTaneous ; 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 ; the third, those 

 which have been literally buried, as the coals and resins. 



The remaining terms will be explained as they arc employed. 



Classis I. EPIG.EA. 



G. under 3.8. No bituminous odor. Taste of solid individuals 

 acid, alkaline, or saline. 



Classis II. ENTOGjEA. 

 G. above 1.8. Tasteless. 



Classis III. IIYPOGiEA. 



G. under 1 B. 



