Shows how common rocks and minerals can be identified by color, texture, hardness, streak and other standard procedures.
Feb 2, 2021
Jan 13, 2016
Feb 15, 2025
Jan 1, 1999
Jan 19, 1991
Jan 1, 1948
Mar 8, 2005
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Sep 20, 2005
Nov 1, 2019
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Sep 28, 2018
Jan 1, 1963
Feb 6, 2023
Nov 25, 2014
Dec 31, 2018
May 17, 2016
Apr 1, 2014
Oct 20, 2016