Mineral Ores

How many known minerals are there?
4071
3800
643
What is the hardest mineral?
Diamond
Platinum
Uraninite
Australia is the .......... Highest exporter of uranium.
1st
3rd
5th
4th
How is the mineral extracted from the ore?
By hand
Using explosives
Smelting
What is the most common mineral?
Feldspar
Amber
Quartz
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