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Excerpt from The Geological Magazine, or Monthly Journal of Geology, Vol. 7: With Which Is Incorporated the Geologist ; Nos; 547 to 558; January December, 1910 The distribution of the nodules is general throughout the basalt of Calton Hill. In a hand-specimen they are easily distinguished and appear as a crystalline aggregate of bottle-green and yellow olivine with dark augite in the fine-grained and nearly black basalt. Some of the nodules are in a very fresh state; in others the cementing material between the grains has been dissolved away and the small grains may easily be separated by the finger. The nodules consist mainly of olivine, but contain a fair proportion of augite, and in some cases a small quantity of picotite. These minerals occur in irregularly Shaped grains without any crystalline boundary, except in ve few instances, especially now the outside of a nodule. The grains are not deformed crystals, but have hindered one another's development as far as crystalline boundary is concerned. Fourteen thin Slices from the nodules were examined. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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