@@ -25,14 +25,16 @@
 for _, c in pairs { 'clay', 'aluminum', 'platinum', 'duranium' } do
 	minetest.register_craftitem('sorcery:crucible_' .. c, {
 		description = sorcery.lib.str.capitalize(c .. ' crucible');
 		inventory_image = 'sorcery_crucible_' .. c .. '.png';
+		groups = { sorcery_metallurgy = 1; }
 	})
 end
 
 minetest.register_craftitem('sorcery:crucible_clay_molding', {
 	description = sorcery.lib.str.capitalize('Crucible molding');
 	inventory_image = 'sorcery_crucible_clay_molding.png';
+	groups = { sorcery_metallurgy = 1; }
 })
 
 minetest.register_craft {
 	recipe = {
@@ -302,8 +304,9 @@
 			mesh = 'sorcery-kiln-' .. state .. '.obj';
 			drop = id;
 			groups = {
 				cracky = (state == 'open' and 2) or nil;
+				sorcery_metallurgy = 1;
 			};
 			sunlight_propagates = true;
 			paramtype1 = 'light';
 			paramtype2 = 'facedir';
@@ -383,8 +386,9 @@
 			drop = id;
 			after_dig_node = sorcery.lib.node.purge_container;
 			groups = {
 				cracky = (active and 2) or nil;
+				sorcery_metallurgy = 1;
 			};
 			paramtype2 = 'facedir';
 			light_source = (active and 9) or 0;
 			on_construct = function(pos)