phosphate rock

noun

First recorded in 1865–70

Phosphorus is obtained from bone ash and from phosphate rock which is widely distributed over the surface of the earth.

But we were not looking for phosphate rock or goldfish; we were simply looking for ripe mullet.

Bound for Norfolk, Virginia, with a cargo of phosphate rock.

It is uncertain whether the placer or lode law applies to the Government phosphate rock.

Doubtless the commercial phosphate rock owes its origin to similar bacterial action in ages past.

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