ThickComb

Monday, February 16, 2004

Black Sand

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

posted by ThickComb at 8:42 AM | 0 comments

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