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1-17 of 17 possibilities

sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages argillite
slag produced in making steel; low in silica but having large amounts of calcium phosphate; useful as fertilizer basic slag
variety of silica containing microcrystalline quartz chert
white mineral consisting of silica; found in volcanic rocks cristobalite
colorless glass made of almost pure silica crystal , lechatelierite , quartz , quartz glass , vitreous silica
microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica diatom
hard kind of stone; a form of silica more opaque than chalcedony flint
mineral form of vitreous or glassy silica; formed by the melting of quartz sand (as by lightning or a meteorite) lechartelierite
any of various earths containing silica and alumina and ferric oxide; used as a pigment ocher , ochre
translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones opal
crystalline silica mineral quartz
pure form of finely ground silica silex
porous form of silica that is highly absorbent silica gel
jellylike substance (hydrated silica) silicic acid
lung disease caused by inhaling particles of silica or quartz or slate silicosis
mineral form of silica tridymite
pigment consisting of a limonite mixed with clay and silica yellow ocher , yellow ochre
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