Sandstone [450 companies]
Greywacke [103 companies]
Gritstone [122 companies]
Silica stone [264 companies]
Quartzite [240 companies]
Breccia and pudding stone (conglomerate) [23 companies]
Chippings and ballast, quartzitic [52 companies]
Sandstone and quartzite for grindstones and pulpstones [106 companies]

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