Indestructible Cell Walls: The cell walls of chrysophytes (specifically diatoms) consist of two thin overlapping shells that fit together like a soap box.

Silica Deposition: These walls are embedded with silica, making them extremely hard and virtually indestructible.

Diatomaceous Earth: Because they do not decay, the accumulation of these silica-rich cell walls over millions of years on the sea floor forms "diatomaceous earth".

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