black sand

black sand
Accumulation of fragments of durable, usually dark, heavy minerals (those with a density greater than that of quartz).

These accumulations are found in streambeds or on beaches where stream flow and wave energy are sufficient to carry away low-density material but not the heavy minerals. Thus, heavy minerals resistant to weathering and abrasion concentrate in these areas, though they may be only minor constituents of inland rocks. Placer mining of such deposits yields magnetite, cassiterite, and zircon, as well as gold, platinum, and other rare metals.

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      accumulation of fragments of durable heavy minerals (those with a density greater than that of quartz), usually of a dark colour. These accumulations are found in streambeds or on beaches where stream and wave energy was sufficient to carry away low-density material but not the heavy minerals. Thus, heavy minerals resistant to weathering and abrasion concentrate in these areas, though they may be only minor constituents of inland rocks. Placer mining of such deposits yields magnetite, cassiterite, and zircon and gold, platinum, and other rare metals.

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Universalium. 2010.

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