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 ?
Results of the alkali reactivity tests for quartzite and granite aggregates, hornstone and quartz sand with opal have been shown in Figs 1-4.
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).
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.
It was a piece of hornstone, which I told him his tribe had probably brought here centuries before to make arrow-heads of.