246 MR. G. M. DATIES ON THE MIXEEAL [Juiie I912, 



Table I. — Composition of the Samples. 



Sample Number 



Weight of sample, dried, in 

 grammes 



Percentage of sand in sample 



Percentage of vegetable matter in 

 sample ^ 



Percentage of calcareous matter in 

 sand 



Percentage of total heavj^ residue in 

 sand 



Percentage of pyrrhotite in sand ... 



Percentage of detrital lieavj' mine- 

 rals in sand 



Percentage of detrital heavj' mine- 

 rals in original sample 



1. 2. 3. 4. 5 



784-5 

 11-9 



15-0 

 21 



7-9 

 0-52 



0-046 

 0-005 



1608-5 

 31-4 



1-7 

 17 



0-41 

 trace 



0-12 

 0-038 



631 

 11-2 



4-87 

 0-71 



0-065 

 0-007 



589 



403 



49-1 



50-1 



1-4 



about 1 



4-3 



11-5 



0-6 



0-55 



... 



0-26 



0-07 



0-09 



0034 



0-045 



351 

 49-3 



0-9 

 11-5 



0-53 

 0-27 



0-09 

 0-044 



1 These figures represent the vegetable matter, with a small admixture of shell- 

 fragments, etc., washed off and caught in the 60- mesh sieve. Thej^ are tabulated 

 mereh' for purposes of comparison, and are not to be taken as the absolute amounts 

 present in the samples. 



Table II. — Minerals present in the Sandy Eesidties 

 (in orber of relative abundance). 



Sample Xumber 



Quartz j X 



Quartzite I X 



Flint . 



Felspar 



Glauconite 

 Pyrrhotite 



Pyrites 



Limonite .. 



Garnet X 



Tourmaline 



Staurolite . . . 

 Hornblende 



Epidote 



Zircon 



Kyanite ... 

 Ilmenite ... 



Rutile 



Audalusite 



Apatite 



Mica 



Pyroxene (monoclinic) ' X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 1 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



/ 



X 



X 



X 



X 



X 



X 





X 







X 



X 



X 



X 





