| 11. | Nephelinite is an example of a silica-undersaturated igneous rock.
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| 12. | Silica-saturated igneous rocks fall in between these two classes.
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| 13. | The oldest flux used for forge welding was fine silica sand.
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| 14. | The silicotic nodule represents a specific tissue response to crystalline silica.
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| 15. | No replenishing is necessary with silica gel ( crystal ) litter.
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| 16. | While diatomaceous earth performed poorly, silica gel may be effective.
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| 17. | It is decomposed by hydrochloric acid with separation of gelatinous silica.
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| 18. | Rocks high in silica produce silicic acid as a weathering product.
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| 19. | The ground was donated by the Silica Firebrick Company in 1921.
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| 20. | The binder is a combination of silica sol and water glass.
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