Bauxite
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| Frequency | common |
|---|---|
| Hardness | 3.5 |
| Density | 3.04 |
| Chemical Formula | Al(OH)3.AlO(OH) |
| Core Elements | Al, Si, Fe |
Bauxite is the primary ore of aluminum. It contains 30-55% aluminum oxide, the remaining fraction being a mixture of silicon dioxide, hematite and magnetite.