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Why are some sands black?

Updated: 9/27/2023
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15y ago

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The redness of sand is determined by the level of Iron Oxide (think rust) spread throughout the sand in question. High levels of Iron Oxide are indicated by a distinctly red hue, and low levels with sand that does not look red in the slightest. While there may be other factors, Iron Oxide distribution is by far the greatest.

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13y ago
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15y ago

because it has "tar" in it, which is actually crude oil because it has "tar" in it, which is actually crude oil

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Q: Why are some sands black?
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