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Not all sand is white. There is some white sand, but a number of other shades exist from tan to black. The white sand at White Sands National Monument is white because of the gypsum in it, while the white sand of beaches in the remote oceans is composed largely of calcium carbonate from shell and coral fragments. Tan or beige sand is often quartz, and black volcanic sand is rich in basalts and obsidian.

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βˆ™ 13y ago
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βˆ™ 9y ago

Not all deserts are, it depends on the soil and the bedrock in the area. But generally, all other colors than white will absorb more energy from the sunlight than white, and this absorbtion will make them hotter and speed up their breakdown. And that breakdown tends to leave them paler. White OTOH, well, it's hard to bleach white.

the sun bleaches the silica particles in turn remove any pigmentation form the exposed surface

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Q: Why is the desert white?
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