On Ferrierite, New Zeolitic Mineral, From British Columbia

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Excerpt from On Ferrierite, New Zeolitic Mineral, From British Columbia: With Notes on Some Other Canadian MineralsIt was necessary to employ very small plates for the deter mination of the refractive indices, because in the larger blades, the face a(loo) is never a perfect plane. It is believed, however, that the values given above are approximately correct.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.