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黑沙(Black sand)是由海水搬運積聚的礦物碎屑形成的漂砂沉積。若堆積體的數量極多,可以形成海灘

沙呈黑色或深色,主要因所沖刷的重礦物為深色。在海灘上,海浪的能量把比重小的礦物帶走,只留下抗風化和抗磨蝕的重礦物於海灘上。此些重礦物沈積物的可能是石、石或稀有金屬

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