Shows how common rocks and minerals can be identified by color, texture, hardness, streak and other standard procedures.
United States of America
Documentary
13 minutes
1971
Coronet Films

1991
6.8

1999
0.0

2017
6.9

2021
10.0

1963
0.0

2005
0.0
1948
0.0

2025
8.0

2016
8.1

2019
0.0

2020
4.5
2018
0.0

2018
6.9

2016
0.0

2023
8.5

2005
0.0

2012
8.8

2014
0.0

2018
0.0

2009
5.8