The Rocks of Cape Colville Peninsula Auckland New Zealand volume 1
The Rocks of Cape Colville Peninsula Auckland New Zealand volume 1
W J William Johnson Sollas
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It is difficult to say whether this rock was originally an andesite or a dacite ; it would be strictly true to call it an Altered Hornblende Andesite, containing quartz in the groundmass. Illustration. The slice shows in several cases the crystal outlines dark or with a dark border, and there is thus sufficient contrast of the different constituents. Photographed by ordinary light ; magnification, 40 diameters ; area photographed, upper right. The slice is varied, and it can hardly be said that... the illustration repre- sents other than the part photographed. It would require the whole to be photo- graphed to fairly represent the slice. Locality. The Kathleen Crown Mine, Kapanga district. Formation. Kapanga group. ' Remarks. This rock was passed through in sinking the shaft of the mine. At the time it was thought to be a dyke rock, and a northern continuation of Castle Eock. There are no distinct proofs of these statements, and it seems fully as likely that we have to do with a lava-stream.
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