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Custer Feldpar - 325 Mesh for glazes Other products by Miscellaneous

Item No. BUCUSTER325
  (order in 50# increments)

Available Discounts
Dry Clays
  • buy up to 499, save $0.00 each
  • buy 500 to 999, save $0.01 each
  • buy 1000 to 1999, save $0.02 each
  • buy at least 2000, save $0.03 each
Custer Feldspar is a potash feldspar.
Feldspar is a large group of minerals which have decomposed from granite and igneous rocks and are thus allied to clay. The main group consists of the alumino-silicates of potassium, sodium, calcium, and, more rarely, barium. The ideal formulas, never quite achieved in nature are:
Potash Feldspar, Orthoclase Microline, K2.Al2O3.6SiO2
Soda Feldspar, Albite, Na2O. Al2O3.6SiO2
Lime Feldspar, Anorthite, CaO.Al2O3.2SiO2
Feldspars are the most useful minerals in ceramics, apart from clays. Used as a primary flux above 1200°C (2192°F) and a secondary flux in earthenware. - p. 108, Illustrated Dictionary of Practical Pottery, 3rd Ed. by Robert Fournier
50# bag; blue bag, black text Pacer Custer Feldspar
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