Go to National Library of New Zealand Te Puna Mātauranga o Aotearoa
Volume 20, 1887
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Papers.—1. “Remarks on a Collection made by Captain Fairchild, of Rocks from the Kermadec Islands,” by Sir James Hector.

The rock specimens indicate the presence of trachyte and rhyolite, and also lava rocks, and with the latter are the breccias composed of large angular masses of a singular fibrous pumice, cemented by calcedonic quartz, the matrix also containing gypsum and magnetic iron. Some of the felspathic trachytes are so heavily charged with magnetic iron in fine grains as to give the rock the gravity and appearance of a basic rock.