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Clay mineral
Answer for the clue "Clay mineral ", 7 letters:
nacrite
Word definitions for nacrite in dictionaries
Wiktionary
Word definitions in Wiktionary
n. (context mineralogy English) A basic aluminium silicate clay that is a polymorph of kaolinite
Wikipedia
Word definitions in Wikipedia
Nacrite Al Si O ( OH ) is a clay mineral that is polymorphous (or polytypic ) with kaolinite . It crystallizes in the monoclinic system. X-ray diffraction analysis is required for positive identification. Nacrite was first described in 1807 for an occurrence ...