How to Know the Minerals and Rocks
Description:
SUBJECT: "Field guide to more than 125 of the most important minerals and rocks, including gems, ores, native metals, meteorites, etc. Written for the beginning and amateur collector. The four keys to recognizing rocks make it easy to identify the chief types by a simple but systematic procedure. No special skill is needed for the tests, just a pocket-knife, common magnet, piece of broken porcelain, piece of glass, a copper coin, piece of quartz, and some vinegar."
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