Short featurette about the mineral ore and its economic importance.
17m
7.8·2021
6.5·2001
7.1·1937
7.0·1929
6.3·2025
6.5·1947
7.4·2016
6.4·2017
7.0·2018
6.2·2022
7.4·2017
6.2·2018
6.6·2018
6.2·1955
6.7·2014
7.1·1931
7.4·2001
5.9·2021
6.9·2001
