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Diatom cell walls form two thin, overlapping shells and are embedded with silica, making them indestructible. Their accumulated cell-wall deposits form diatomaceous earth.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Protista - Chrysophytes and Dinoflagellates
Chrysophytes, which include diatoms and golden algae (desmids), have unique cell walls forming two thin overlapping shells that fit together. According to NCERT, these walls are heavily embedded with silica, making them practically indestructible. Over billions of years, diatoms leave behind large amounts of these silica cell wall deposits in their habitat, which accumulates to form gritty 'diatomaceous earth', used commercially in filtration and polishing.
Ref: NCERT Class 11 Biology > Chapter 2: Biological Classification > 2.2 Kingdom Protista
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