diatomite

noun

powdery earth made from diatoms

Wiktionary

Pronunciation: /daɪˈæt.əˌmaɪt/

noun

Etymology: Etymology tree English diatom Proto-Indo-European *-tósder. Ancient Greek -της (-tēs)der. Ancient Greek -ῑ́της (-ī́tēs)der. Latin -ītēsbor. French -iteder. English -ite English diatomite From diatom + -ite.

A fine, powdery earth formed from the skeletons of diatoms