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nouna white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite
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Definition that contains silica
- crystal colorless glass made of almost pure silica
- flint a hard kind of stone; a form of silica more opaque than chalcedony
- opal a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones
- topaz a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstone
- talcum a fine grained mineral having a soft soapy feel and consisting of hydrated magnesium silicate; used in a variety of products including talcum powder
- basilica an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges
- quartz colorless glass made of almost pure silica
- mica any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
- talc a fine grained mineral having a soft soapy feel and consisting of hydrated magnesium silicate; used in a variety of products including talcum powder
- ochre any of various earths containing silica and alumina and ferric oxide; used as a pigment