Monthly Tech-Tip from Tony Hansen SignUp

No tracking! No ads!

1-9 | A | B | C | D | E | F | Frits | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z


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


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, Fortisparâ„¢ K offers low iron oxide and high alkali oxide content per unit of alumina.

Related Information


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
Follow me on

Got a Question?

Buy me a coffee and we can talk, All Rights Reserved
Privacy Policy