Minerals, ground or treated

Minerals, ground or otherwise treated

Barite, ground or otherwise treated

Feldspar, ground or otherwise treated

Flint, ground or otherwise treated

Magnesite, crude: ground, calcined, or dead-burned

Mica, ground or otherwise treated

Pyrophyllite, ground or otherwise treated

Spar, ground or otherwise treated

Steatite, ground or otherwise treated

Talc, ground or otherwise treated

Earths, ground or otherwise treated

Barium, ground or otherwise treated

Clay for petroleum refining, chemically processed

Clay, ground or otherwise treated

Desiccants, clay: activated

Diatomaceous earth, ground or otherwise treated

Filtering clays, treated

Fuller's earth, ground or otherwise treated

Graphite, natural: ground, pulverized, refined, or blended