Notes on Canadian Minerals. 9*7 



Eedpath Museum. The garnet is associated with calcite, 

 quartz, vesuvianite, &c, crystals of the last-named mineral 

 often penetrating those of garnet. The latter occurs hoth 

 massive and crystallised in rhombic dodecahedrons, one of 

 which, in the Redpath Museum, is over 2^- inches in 

 diameter. The specimen examined was of a cinnamon- 

 brown colour and had a specific gravity of 3 - 58. The 

 analysis was made by Mr. James C. Brown, a student in the 

 chemical laboratory, and gave the following results : — 



Silica 36-22 



Alumina 18-23 



Ferric Oxide 7-17 



Manganous Oxide 0-63 



Lime 37-39 



Magnesia tr. 



Loss on ignition 070 



100-34 



Visitors to Murray Bay, below Quebec, are familiar with 

 the deep rose-red garnet which occurs abundantly in the 

 Laurentian gneiss of that region. A specimen with a specific 

 gravity of 4-047 has been analysed by Mr. R. H. Jamieson, 

 chemistry student, with the following result : 



Silica 37-97 



Alumina 22-44 



Ferric Oxide 2-39 



Ferrous Oxide 26-12 



Manganous Oxide 1'IS 



Lime 5-27 



Magnesia 5-43 



100-80 



The mineral is, therefore, almandine, and this is no doubt 

 the variety of garnet which commonly occurs in the 

 Laurentian gneisses. 



4. — Chalcedony Concretions. 



The exact locality from which these curious concretions 

 were obtained is not known to the writer, but they are said 



