| 21. | The fort is made of stones rich in iron content which protects it from cannon attacks.
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| 22. | It is thought to be one " strongest of tonics " for its high iron content.
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| 23. | The water's excessive iron content meant that it could not be used as effectively as hoped.
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| 24. | The blue-grey colour is provided by its iron content, enclosed to a large extent in pyrites.
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| 25. | He said the iron content would be worth only about 14, 500 pesos ( dlrs 584 ).
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| 26. | The iron content is linked with the slag composition, the others elements are taken in the metal.
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| 27. | However, during the rainy season, the iron content though high, was found to be within permissible limits.
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| 28. | Pure magnesium tremolite is creamy white, but the color grades to dark green with increasing iron content.
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| 29. | Certain properties such as the iron content may be controlled, changing the thermal emissivity properties of glass.
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| 30. | Iron substitutes for magnesium in variable amounts leading to the more common biotite with higher iron content.
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