siliceous

A peculiar small siliceous spicule having a denticulated wheel at each end

Lydian stone, or black jasper, a variety of siliceous or flinty slate, of a grayish or bluish black color

n a light soil consisting of siliceous diatom remains and often used as a filtering material

plural of diatomite n a light soil consisting of siliceous diatom remains and often used as a filtering material

The siliceous shell of a diatom