Proceedings Of The Washington Academy Of Sciences Vol 13

Author : Sidney Paige
Publisher :
ISBN 13 : 9781332303397
Total Pages : 568 pages
Book Rating : 4.3/5 (33 download)

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Download or read book Journal of the Washington Academy of Sciences, 1923, Vol. 13 (Classic Reprint) written by Sidney Paige and published by . This book was released on 2015-08-05 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Journal of the Washington Academy of Sciences, 1923, Vol. 13 In a recent paper the writer described some alnoitic rocks from Isle Cadieux, Quebec, that contain the mineral, monticellite. This was presumed to be the first recognition of monticellite as an igneous rock mineral.2 After the paper was published K.H. Scheumann called my attention to a mineral occurring in rocks of a related character from Polzen, Bohemia, of which mineral he has said: "Perhaps we are dealing with monticellite, whose occurrence in a rock so rich in magnesia would not be surprising, or perhaps with an olivine rich in the monticellite molecule." Scheumann's descriptions show that the mineral is, with little possible doubt, the same as that in the Canadian rocks and is to be regarded as monticellite even though his optical determinations were not sufficiently quantitative to establish its identity. These observations of Scheumann swere not known to me nor were they recalled by any of the petrologists with whom I discussed the occurrence of monticellite in igneous rocks. Had the Polzen rocks been described under more familiar names such as alnoite, melilite basalt, with such qualifying terms as may have been necessary, they and their characters would not have escaped my notice in general abstract literature, but appearing under the disguise of locality names it is perhaps not surprising that they did not attract attention. Of this matter more later. In the paper on the Cadieux rocks were included the results of some experimental work designed to throw light on the origin of some of the mineral phases present. 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.