The geology of an area in Litchfield county, Connecticut (Google eBook)

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University of Wisconsin--Madison, 1899 - History
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Page 32 - ... composition to the normal granite. They are much coarser grained and far more numerous than the pegmatites which accompany the Quincy granite. The rocks into which the Andover granite has been intruded are cut by numerous small masses and irregular dikes of an alaskitic granite composed essentially of feldspar and quartz. The feldspar is orthoclase, microcline, and albite. The alaskites are uniformly gneissic and weather red. Alteration. Although gneissic and usually more altered than the...
Page 3 - U7ith the atlas sheets of the United States Geological Survey as a basis, the mapping of the area was done, and a set of rocks collected, some of which were studied microscopically.

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