hornstone


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Synonyms for hornstone

a fine-grained metamorphic rock formed by the action of heat on clay rocks

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References in periodicals archive ?
However, the bars with the remaining three aggregate types: quartzite, hornstone and granite have not shown expansion which would testify to aggregate alkali reactivity (Fig 2) during the test of up to 180 days.
The aggregate obtained though the breaking up of hornstone, ie silified limestone, has also been used in tests.
The results obtained by means of the chemical method in accordance with the ASTM C 289 place opal and granite in the field of potentially reactive aggregate, while the results for quartzite and hornstone demonstrate that these are irreactive aggregates (Fig 1).