import mods.mekanism.api.ingredient.ChemicalStackIngredient.GasStackIngredient;
import mods.mekanism.api.ingredient.ItemStackIngredient;

<recipetype:mekanism:purifying>.addRecipe("uraninite", <tag:items:forge:ingots/uranium>, <gas:mekanism:oxygen>, <item:powah:uraninite>);
<recipetype:mekanism:purifying>.addRecipe("endstone", <item:silentgems:hardened_end_stone>, <gas:mekanism:oxygen>, <item:minecraft:end_stone>);