Read Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7 (Classic Reprint)

Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7 (Classic Reprint)

Australia Department of Mines

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Description:Excerpt from Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7This remarkably sharp boundary between the two formations, when considered in conjunction with the occurrence of the round masses boulders of andesite imbedded in serpentine, naturally suggests the idea that the serpentine has been derived from the decomposition of the augite-andesite. A microscopic examina tion of thin slices of a number of specimens of rock, from both the hanging and foot walls of the fissure, has lately been made by Professor David, and fully bears out this assumption. In many cases the porphyritic crystals of augite show, under the microscope, every stage of passage from a condition of unaltered pyroxene into pseudomorphs of serpentine. Similar evidence was obtained from thin slices of the hard rock forming one of the rounded masses or boulders. An apparently homogeneous rock of dark colour, which is termed black rock by the miners, and which is sometimes found between the typical serpentine and the andesite, is seen, under the microscope, to consist of dense serpentine. An extremely hard and tough rock of a light greenish-gray colour, which has received the name of old man from the miners, consists of nephrite or jade. This rock only occurs where there is an ore-body, and is then found, a foot or more in width, between the ore and the hanging wall of serpentine.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.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7 (Classic Reprint). To get started finding Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7 (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
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Description: Excerpt from Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7This remarkably sharp boundary between the two formations, when considered in conjunction with the occurrence of the round masses boulders of andesite imbedded in serpentine, naturally suggests the idea that the serpentine has been derived from the decomposition of the augite-andesite. A microscopic examina tion of thin slices of a number of specimens of rock, from both the hanging and foot walls of the fissure, has lately been made by Professor David, and fully bears out this assumption. In many cases the porphyritic crystals of augite show, under the microscope, every stage of passage from a condition of unaltered pyroxene into pseudomorphs of serpentine. Similar evidence was obtained from thin slices of the hard rock forming one of the rounded masses or boulders. An apparently homogeneous rock of dark colour, which is termed black rock by the miners, and which is sometimes found between the typical serpentine and the andesite, is seen, under the microscope, to consist of dense serpentine. An extremely hard and tough rock of a light greenish-gray colour, which has received the name of old man from the miners, consists of nephrite or jade. This rock only occurs where there is an ore-body, and is then found, a foot or more in width, between the ore and the hanging wall of serpentine.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.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7 (Classic Reprint). To get started finding Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7 (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7 (Classic Reprint)

Records of the Geological Survey of New South Wales, 1900-1901, Vol. 7 (Classic Reprint)

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