Notes on Certain Archaean Rocks of the Ottawa Valley (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from Notes on Certain Archaean Rocks of the Ottawa Valley

Mica occurs in quantities almost equal to the feldspar. In sections parallel to the lamination it exhibits irregularly rounded and ragged forms, and in sections at right angles it is often bent and opened up. The pleochroism is very characteristic, the colours varying between a bright reddish-yellow and dark reddish-brown; basal sections exhibit no marked differences in absorption. The inclusions in the form of small colourless rounded grains and small crystals of high refractive index and high double refraction are zircons; around these there is generally a dark non~pleochroitic area.

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