How could you distinguish (a) chert from obsidian; (b) conglomerate from gneiss; (c) quartz from calcite?

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How could you distinguish 

(a) chert from obsidian;

(b) conglomerate from gneiss; 

(c) quartz from calcite?

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Related Book For  book-img-for-question

The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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