. Ontario Sessional Papers, 1914, \f*<5f^ r;^,..,. Greenstone near Murra> Mine. Sudbur> Where best preserved the rock is a fine-grained grey lava, with amygdaloids andpillow structure, but in many places it has been weathered to greenstone or squeezedinto green schist. Thin sections of the freshest examples consist of bytownite, hypers-thene and augite, with a considerable amount of magnetite. The rock contains lessthan 47 per cent, of silica and is distinctly more basic than the nickel-bearing norite,which contains on the average per In former reports by the pres
. Ontario Sessional Papers, 1914, \f*<5f^ r;^,..,. Greenstone near Murra> Mine. Sudbur> Where best preserved the rock is a fine-grained grey lava, with amygdaloids andpillow structure, but in many places it has been weathered to greenstone or squeezedinto green schist. Thin sections of the freshest examples consist of bytownite, hypers-thene and augite, with a considerable amount of magnetite. The rock contains lessthan 47 per cent, of silica and is distinctly more basic than the nickel-bearing norite,which contains on the average per In former reports by the presentwriter it has been called older norite, since its mineral composition is that of avery basic norite; but it is suggested by Dr. Miller that as an effusive or volcanic itshould probably have a separate name. It may be called sudburite, for the regionin which it was found, and it may be considered as having the same relation to noriteas that of basalt to gabbro or rhyolite to granite. It differs from basalt in having noglass or olivine, and in the equidime
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