Cassiterite, rutile, ilmenite, zircon, monazite, magnetite, barite, lime, sand, and gravel are the chief surfacial materials which occur as placers and have been for economical recovered purposes from the marine environment.
Source: wiktionary
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Cassiterite, rutile, ilmenite, zircon, monazite, magnetite, barite, lime, sand, and gravel are the chief surfacial materials which occur as placers and have been for economical recovered purposes from the marine environment.
Source: wiktionary