Fixed the careless mistake I forgot I committed.

mineralz/minerals.lua

@@ -84,7 +84,7 @@ minetest.register_node("mineralz:stone_with_malachite", {
 	},
 })
 
-minetest.register_item("mineralz:salt", {
+minetest.register_craftitem("mineralz:salt", {
 	description = "Salt",
 	inventory_image = "mineralz_salt.png",
 })
@@ -101,8 +101,8 @@ minetest.register_node("mineralz:salt_block", {
 })
 
 minetest.register_node("mineralz:sandstone_with_salt", {
-	description "Sandstone with Salt",
-	tiles = {"default_sandstone.png^mineralz_salt_ore.png"}.
+	description = "Sandstone with Salt",
+	tiles = {"default_sandstone.png^mineralz_salt_ore.png"},
 	is_ground_content = true,
 	groups = {cracky=1,level=1},
 	sounds = default.node_sound_stone_defaults,

rockz/init.lua

@@ -193,7 +193,8 @@ for _,rock in pairs(stonez) do
 	-- block_form denotes what the name of the blocks to insert should be with @ being replaced with the local stone variable. eg @_cobble = andesite_cobble
 	local block_form = {"@_cobble", "@_block", "@_brick", "polished_@", "polished_@_block", "polished_@_brick"}
 	for _,form in pairs(block_form) do
-		table.insert(rockznodes, form:gsub("@",stone))
+		--table.insert(rockznodes, #rockznodes+1, form:gsub("@",stone)) -- Why?
+		rockznodes[#rockznodes+1] = form:gsub("@",stone)
 	end
 end