Fortispar

Oxide	Analysis	Formula
SiO2	64.85%	6.61
Al2O3	18.06%	1.08
Fe2O3	0.07%	-
CaO	0.14%	0.02
MgO	0.03%	-
K2O	13.18%	0.86
Na2O	1.25%	0.12
LOI	0.26%	n/a
Oxide Weight		597.49
Formula Weight		599.05

Notes

I-Minerals states that they are "focusing on potassium feldspar (K-spar). Deposits of high quality K-spar that can be economically extracted are rare. This rarity of quality deposits has resulted in K-spar selling at much higher prices than sodium feldspar. At present there is no domestic U.S. production of K-spar with K₂O purities in excess of 10.0%. I-Minerals is developing a series of K-spar products under the Fortispar TM branding in the 12.5% to 13% K20 range. Fortispar products will be offered in 200, 325 and 635 mesh grinds to meet the requirements of a given industry."

Fortispar is a high quality potassium/sodium/calcium aluminum silicate used as a source of alumina and potash in ceramic, paint, and other
applications. Carefully beneficiated using the froth flotation process, Fortispar™ K offers low iron oxide and high alkali oxide content per unit of alumina.

Related Information

Links

URLs	https://www.imineralsinc.com/assets/docs/productsheets/fortispar-k.pdf Fortispar Data Sheet
Materials	Mahavir Potash Feldspar
Materials	Custer Feldspar The most common potash feldspar used in ceramics in North America. While having been a standard for many decades its supply appears in doubt in 2024.

By Tony Hansen
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