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Which of the following minerals is NOT found in rivers (alluvial placers) and on the coast, especially beaches (beach placers)?
Bauxite
Gold
Tin
Platinum
- Bauxite
- Bauxite is an aluminum ore.
- It does not typically form in alluvial or beach placers.
- It is instead found in sedimentary rocks, often in topsoil in tropical and subtropical regions.
- Gold
- Gold is a dense metal, often found in placer deposits.
- Rivers and beaches can accumulate gold due to water movement.
- Tin
- Tin is commonly found in alluvial and beach placers.
- It is often associated with the mineral cassiterite.
- Platinum
- Platinum is dense and malleable.
- It is frequently found in placer deposits in streams and beach areas.
Bauxite is NOT found in rivers and on beaches as a placer mineral.
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