| prov:value
| - The method of claim 27, wherein the aggregate is a material selected from the group consisting of diamond, corundum, emery, garnet, staurolite, flint, novacululite, quartz, quartzite, sandstone, limestone, basalt, feldspar, granite, mica, perlite, pumice, apatite, calcite, chalk, clay, diatomite, iron oxides, lime stones, talc, and Tripoli.
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