[ADAMS A BARLowJ ALKALI SYENITES OF EASTERN ONTARIO 43 



Anorthite 12.51 



Nepheline 67,72 



Leucite 8.28 



Olivine 3.70 



Akennanite .40 



Magnetite .70 



Ilmenite .30 



Pyrite .14 



Calcite 4.92 



98.67 

 Water 1.00 



99J3'7 



This gives the rock the following position in the Quantitative Clas- 

 wfieation : — 



Class I Persalane. 



Order 8 Ontarare. 



Rang 2 . (Domalkahf). 



Sub-rang 4 (Dosodic). 



As this is the first Ontarare which has been described, the rangs 

 and sub-rangs have received no names as yet. It is proposed, therefore, 

 to call rang 2 Monmouthase, and sub-rang 4 Monmouthose, from the 

 township of Monmouth in which this rock is found, while, as an ordinary 

 designation, the name Monmouthite may be applied. 



The mode, or actual mineralogical composition of the rock, is quite 

 different from the norm, as given above, no leucite, anorthite, olivine, or 

 akermanite being actually present. The mode is abnormative to a strik- 

 ing degree. 



The mode is as follows : — 



Albite 1.83 



Nepheline 72.20 



Sodalite .28 . 



Cancrinite 5.14 



Hornblende . 15.09 



Hematite .50 



Calcite 3.12 



Pyrite .14 



98.30 



Water .50 



Excess of A1,,0, 1.20 



100.00 

 * See Quantitative Classification (loc. cit.), p. 150. 



