- Oak Blend Ball Clay
- Oakwood Ash
- OB206/7 Clay (Westerwald, Germany - Plastic Clay)
- OBSIDIAN
- Ochre
- Ochre (From Ron Roy's MDT)
- Ocmulgee Red Clay (HIGH IRON CLAY)
- Odo
- Old Hick #56SR (From Ron Roy's MDT)
- Old Hickory FC340 Ball Clay
- Old Hickory No 6 Ball Clay (Legacy ball clay)
- Old Hickory No. 1 Glaze Ball Clay (Kentucky Ball Clay, Glaze #1, Glaze Number 1, Glaze No 1)
- Old Hickory No. 2 Ball Clay (Legacy ball clay)
- Old Hickory No. 3 Ball Clay (Legacy ball clay)
- Old Mine Kaolin (Originally from Harris Mining Co.)
- OLIGOCLASE
- Olivine
- OM #4 Ball Clay (Tennessee Ball Clay)
- Omr Ball Clay (Tennessee Ball Clay)
- Onmillion Feldspar (LOW IRON FELDSPAR)
- OOLITE
- Ooyatsu
- OPACIFIERS
- OPAL
- Opax (Zirconium Oxide, Zirconia)
- OPENING MATERIALS
- Orthoclase
- ORTHOSE
- OSML Ball Clay
- Oxford Feldspar (Potash Feldspar)
- OXIDES
- OXYGEN
- Oyster Shells
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