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Potter's earth, potter's clay, clay, secondary clay, argil, adobe,
porcelain clay, refractory clay, lean clay, marl, kaolin, slip, engobe, china
clay, calcareous clay, pegmatite, pipe clay china stone, petuntze, Cornish
stone, silica, feldspar, flint, flint pebbles, gypsum, bone ash.
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Soap stone, sand stone, marvel, granite, mosaic marvel and
alabaster.
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