Hi-Jinks says
Might be high in iron, but why guess?
Get a soil test from your local county plant clinic.
Philip Bradbury says
Iron, as in rusting iron. So, Ayers Rock, in the middle of Australia, is the single biggest lump of rusting iron ever discovered.
Iron sands, by the sea, are black because they're mixed with salt and, when it's exposed to the air, without thesalt, they go red.
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