Grolleg (English china clay) supplies SiO2, Al2O3, Fe2O3, and
small amounts of several fluxes.
A primary (residual) kaolin formed by the action of
hydrothermal vapors on soda feldspar in granites and pegmatites.
81% kaolinite, 15% mica, 4% feldspar and other minerals.
Manufactured by ECC International; comes from southwest England.
Plastic and white-firing, low shrinkage, excellent hardness.
(courtesy of glazy.org)
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