. Ontario Sessional Papers, 1914, rock rather than the name porphyrite or diorite porphyrite. Pheno-crysts of albite are prominent in the rock, while other acidic feldspars are also ferro-magnesian minerals occur only in minor quantity. In some phases of therock the abundance of albite suggests the term albite porphyry. MacLaren usesthe term albite porphyry or feldspar porphyry to describe a dike rock which isassociated with the gold deposits of Kalgoorlie, West Australia. The albite porphyry 1 21st Annual Report, Bureau of Mines, Ont., 1912, p. 262. * Geology of the Kalgoo
. Ontario Sessional Papers, 1914, rock rather than the name porphyrite or diorite porphyrite. Pheno-crysts of albite are prominent in the rock, while other acidic feldspars are also ferro-magnesian minerals occur only in minor quantity. In some phases of therock the abundance of albite suggests the term albite porphyry. MacLaren usesthe term albite porphyry or feldspar porphyry to describe a dike rock which isassociated with the gold deposits of Kalgoorlie, West Australia. The albite porphyry 1 21st Annual Report, Bureau of Mines, Ont., 1912, p. 262. * Geology of the Kalgoorlie Goldfield, Mining and Scientific Press. 1913, Vol. 107, p. 97. 16 Bureau of Mines No. 4 of Kalgoorlie is characterized by the presence of notably large, well-shaped crystals offeldspar, but does not contain the hornblende or biotite that are found in the porphy-rites which are described by MacLaren as ranging from dark grey to bluish rocks likediorite to light porphyritic rocks distinguishable with difficulty from Photomicrograph of reddish feldspar-porph\ r> , from northpart of Burnside claim, L. 1823. X 19 diameters.
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Keywords: ., bookauthorontariolegislativeass, bookcentury1900, bookdecade1910
