黑沙(Black sand)是由海水搬运积聚的矿物碎屑形成的漂砂沉积。若堆积体的数量极多,可以形成海滩

沙呈黑色或深色,主要因所冲刷的重矿物为深色。在海滩上,海浪的能量把比重小的矿物带走,只留下抗风化和抗磨蚀的重矿物于海滩上。此些重矿物沉积物的可能是石、石或稀有金属

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