[Building materials, namely, concrete; concrete compositions;] aggregates composed of quartz, metakaolin, diatomite, perlite, sand, limestone, marble or chalk for use in the preparation of concrete; Pozzolanic cement; [Portland cement; cement compositions in the nature of cement mixes; blended cements in the nature of cement mixes;] aggregates composed of quartz, metakaolin, diatomite, perlite, sand, limestone, marble or chalk for use in making cements; feldspar; [feldspathic sand,] marble; n...

[ Industrial mineral processing and refining and chemical treatment of industrial minerals ]

Propping agents used during hydraulic fracturing operations in oil wells and gas wells

Proppants, namely, propping agents used during hydraulic fracturing operations in oil wells and gas wells