Excerpt from The Silica Refractories of Pennsylvania Certain portions of the Chiekies formation from the Upper Cam brian in southeastern Pennsvlvania contain sufficient mica to justifv the name mica schist instead of quartzite, the name of the rock which comprises the greater part of this formation. Some bands of this mica schist make a very good refractorv because the rock will stand high temperatures, is durable and easily trimmed. The rock is reallv a highly metamorphosed quartzite with practicallv'all the. Aluminous ...
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Excerpt from The Silica Refractories of Pennsylvania Certain portions of the Chiekies formation from the Upper Cam brian in southeastern Pennsvlvania contain sufficient mica to justifv the name mica schist instead of quartzite, the name of the rock which comprises the greater part of this formation. Some bands of this mica schist make a very good refractorv because the rock will stand high temperatures, is durable and easily trimmed. The rock is reallv a highly metamorphosed quartzite with practicallv'all the. Aluminous impurities altered to muscovite the colorless mica. Here. The mica is not too abundant the fusibihtv of the rock is practicallv that of quartz because even though the mica fuses at a comparativeh low_ten1perature it simply glazes the surface of the rock and exerts ygi'v little influence on the fusibilit; of the rock as a whole. A fusion test on the rock showed that even thin edges on fragments (lid not fuse at. 1700�c. The melting point of cristobalite, the highest'temperature form of silica, is 1710�cl or bv the cone nethod of determining fusion points. - 1790�c. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... 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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Add this copy of The Silica Refractories of Pennsylvania (Classic to cart. $27.87, new condition, Sold by Paperbackshop rated 4.0 out of 5 stars, ships from Bensenville, IL, UNITED STATES, published 2018 by Forgotten Books.
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