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feldspar
HT alkaline fluxes—insoluble aluminum silicates of potassium, sodium, calcium, and/or lithium—inexpensive flux for clay and glaze.Substitution of soda spar for potash spar can lower vitrification by 100 degrees. Toxic in inhalation. See Custer feldspar, G-200, Kona F-4 feldspar, nepheline syenite, spodumene.
