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Excerpt from The Silica Refractories of PennsylvaniaCertain 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

Title : The Silica Refractories of Pennsylvania (Classic Reprint)
Author : E S Moore
Language : en
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Type : PDF, ePub, Kindle
Uploaded : Apr 03, 2021

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