Reviews — Corundum of the Zoutpansherg Fields. 549 



V. — The Corundum of the Zoutpansbeeg Fields and its Matkix. 

 By P. A. Wagner. Trans. Geol. Soc. S. Africa, vol. xxi, 

 pp. 37-42, with 4 plates, 1918. 



SOUTH Africa now ranks as the leading country in the production 

 of corundum, having an output of about 400 tons per month. 

 This comes cliiefly from the Zoutpansherg and Leydsdorp fields. 

 The greater part of the mineral occurs either as eluvial crystals and 

 fragments, or as "boulder" corundum, that is rock-fragments 

 containing it along with other minerals. In this paper the 

 characters of the corundum crystals are fully described and analyses, 

 given. It is shown that the mineral occurs as a constituent of 

 a pegmatite of dioritic type (plumasite-pegmatite) intrusive in the 

 Swaziland series and in various dioritic and gabbroid rocks, probably 

 belonging to the same phase of igneous activity. 



' E. H. R. 



VI. — Contributions to the Mineralogy oe Black Lake Area, 



Quebec. By E. Poitevin and B. P. D. Graham. Canada 



Department of Mines, Geological Survej'", Museum Bulletin 



No. 27, pp. 82, with 12 plates and 22 text-figures. Ottawa, 



1918. 



rriHE Black Lake area is situated in Megantic county, province of 



JL Quebec, and includes one of the most productive portions 



of the great "serpentine belt". Mining is carried on for asbestos 



and chromite, and in the course of these operations many interesting 



minerals have been found. Besides serpentine, other igneous rocks 



are found, including pyroxenite, gabbro, granite, and aplite, as well 



as other more basic varieties. The minerals include sulphides, 



carbonates, and a large variety of silicates : only a few of the more 



interesting types can be mentioned here, such as very well-developed 



crystals of diopside, garnet, vesuvianite, zircon, stichtite. Many of 



these minerals are ricli in lime and are believed to be partly due to 



magmatic concentration after differentiation of an igneous magma, 



the solutions thus formed circulating through the rocks and reacting 



with their earlier constituents. 



R. H. R. 



VII. — Analyses of Canadian Fuels. Part I : The Maritime 

 Provinces. Part II : Quebec and Ontario. Part III : Manitoba 

 AND Saskatchewan. By E. Stansfield and J. H. H. Nicolls. 

 Canada Department of Mines, Bulletins 22, 23, and 24. 

 Ottawa, 1918. 



THESE Bulletins consist of a collection of analyses of coal, peat, 

 oil, oil shale, and natural gas from a large number of localities 

 within the areas specified. The work has been in progress for 

 several years, first at McGill University and afterwards at the 

 Department of Fuels and Fuel-testing, Mines Branch, Department 

 of Mines, Ottawa. The data given are proximate and ultimate 

 analyses, calorific value, fuel ratio, and carbon-hydrogen ratio. The 

 geological relations of the different deposits receive only the briefest 



