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My son recently got a rock tumbler and I was wondering if anybody knows of any resources that would show pictures of the different types of rocks as they would be found on the ground. I live in Chino Hills CA and we have many trails. I wanted to be able to tell the difference between something worth tumbling and something that isn't.

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Any stone quartz rich and smooth not porous (no visible holes) like agates, quartzite or cherts are you best bet for getting a nice tumbled stone.

A great book is:

Gems and Minerals of America: A Guide to Rock Collecting (1st Edition) by Jay Ellis Ransom Hardcover, 705 Pages, Published 1975

ISBN-10: 0-06-013512-3 / 0060135123 ISBN-13: 978-0-06-013512-6 / 9780060135126

Your local library might have a copy of it. See to find on sale on Internet also: used ~$5.00

http://www.gettextbooks.com/isbn/9780060135126

BTW, tumbling stones and rock collecting led me to a career as a geologist.

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