Lagunaclay.com will be importing this material from India. It will be called Mahavir Potash Feldspar. You can find it in the reference materials in your Insight-live.com account. You might like to leave recipes as is (naming G-200 as the material) but insert "Mahavir Potash Feldspar" as the lookup so the chemistry will be correct.
Mahavir Potash Feldspar