Video: Why seashells are tougher than chalk

June 7, 2018, American Chemical Society
Credit: The American Chemical Society

Seashells are made mostly of calcium carbonate, also known as chalk, a mineral soft and crumbly enough to use for sidewalk doodles.

Yet seashells are tough and resilient.

In this video, Reactions explains why seashells are so different, and why you can't use them to draw on your driveway:

Explore further: Mechanical engineer's method to control growth of carbonate-based crystals featured in PNAS

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