F. A. Genih — Contributions to Mineralogy. 203 



The remaining constituents would give the following com- 

 position : 





I. 



Molecular ratio. 





IT. 



Molecular ratio, 



H„0 



= 1-83 



0-102 = 



: 2 



3-22 



0-179 aboi 



SiO„ 



14-89 



0-248 



5 



29-67 



0-495 



A1.0, 



30-45 



0-296 ) 

 0-006 \ 



6 



27-68 



0-270 ) 

 0-004 j" 



Fe o ? 



0-90 



55 



MgO 



. 







0-69 



0-017 \ 



CaO 



51-93 



0-927 



18 



37-47 



0-569 1 

 0-008 f 



Na 2 











0-44 



K 2 



-- — 







0-28 



0-003 J 



12 



100-00 



100-00 



Although these analyses, especially I, show a simple molecu- 

 lar ratio between the constituents, they do not represent the 

 constitution of any known mineral and are evidently mix- 

 tures, the actual nature of which, however, we have no means 

 to determine. From all this, cacoclasite • cannot be considered 

 a good species, but a mixture of quartz, calcite, apatite and 

 other unknown minerals in various proportion, which have the 

 form of scapolite and have resulted from its alteration. 



3. Monazite. — At the Yilleneuve Mica Mine, Ottawa County, 

 Quebec, Canada, an interesting variety of monazite has lately 

 been discovered, of which Professor Gr. Ch. Hoffmann sent me 

 a specimen. 



It has a reddish-brown color, indistinct cleavage and little or 

 slightly waxy luster. The specific gravity of the purest 

 cleavage pieces was found to be =5*233. The analysis gave : 



H 2 .. = 0-78 



Si0 2 0-91 



Th0 2 12-60 



P 2 26-86 



Fe 2 6 3 1-07 



Ce 2 3 24-80 



(LaDi) a O, 26-41 



(YEr) 2 3 4-76 



MgO 0-04 



CaO 1-54 



99-77 



Chemical Laboratory, 

 Philadelphia, 111 S. 10th St., April 29, 1889. 



