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| acidic |
containing a high proportion of acid-forming silica, as rocks or soil. [1/3 definitions] |
| buhrstone |
a type of rock with much silica, used for grinding; millstone. |
| burr3 |
a variety of limestone containing silica, or a millstone made of it; buhrstone. |
| diatom |
any of various tiny single-celled algae having cell walls of silica. |
| glass |
a hard, breakable, usu. transparent material made from silica and metallic oxides and used for windows, bottles, mirrors, and the like. [1/5 definitions] |
| granite |
a coarse-grained igneous rock usu. composed of silica-rich minerals such as quartz, feldspar, and small amounts of mica or amphibole, commonly used for building, sculpture, and the like. [1/2 definitions] |
| ironstone |
any of several iron ores containing impurities of silica and clay. [1/2 definitions] |
| isinglass |
a mineral compound containing silica that can be separated into thin, often transparent layers; mica. [1/2 definitions] |
| opal |
a variously colored, often iridescent, hydrated form of silica often used as a semiprecious stone. |
| radiolarian |
any small marine protozoan having an amoebalike body encased in a silica skeleton. |
| rhyolite |
a fine-grained, volcanic rock that is similar to granite in composition and has a high silica content. |
| silex |
silica, as found in flint or quartz. |
| silica gel |
a highly absorbent form of silica, used mainly as a drying agent. |
| siliceous |
of, containing, or like silica. [2 definitions] |
| silicic |
relating to, containing, or obtained from silicon or silica. |
| silicon |
a hard, dark gray substance that is a chemical element. It is found in silica, a compound that makes up one fourth of the earth's crust. Silicon is used in making glass, concrete, bricks, and computer chips. (symbol: Si) |
| silicosis |
a disabling lung disease caused by prolonged inhalation of silica dust. |
| stoneware |
a hard pottery made with clay having a large proportion of silica or flint. |
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