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plural phytoliths
A small particle of silica or mineral that occurs in many plants. quotations examples
Environmental archaeologist Monica Ramsey, at the University of Toronto, Canada, and her colleagues studied phytoliths – microscopic silica crystals that form in plant tissues – from the site.
2016 October 29, “Sedges, not cereals, fed first settlers”, in New Scientist, number 3097, page 15