write something there

mods/geodes/init.lua

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+geodes = {}
+
+local geode_types = {}
+
+minetest.register_node("geodes:calcite", {
+	description = "Calcite",
+	tiles = {"calcite.png"},
+	groups = {cracky = 3, not_in_creative_inventory = 1},
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("geodes:amethyst_block", {
+	description = "Amethyst Block",
+	tiles = {"amethyst_block.png"},
+	groups = {cracky = 3, not_in_creative_inventory = 1},
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("geodes:basalt", {
+	description = "Basalt",
+	tiles = {"basalt.png"},
+	groups = {cracky = 3, not_in_creative_inventory = 1},
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("geodes:amethyst_crystal", {
+	description = "Amethyst Crystal",
+	tiles = {"amethyst_crystal.png"},
+	inventory_image = "amethyst_crystal.png",
+	drawtype = "plantlike",
+	paramtype = "light",
+	sunlight_propagates = true,
+	paramtype2 = "wallmounted",
+	groups = {cracky = 3, not_in_creative_inventory = 1},
+	sounds = default.node_sound_stone_defaults(),
+	node_box = {
+		type = "fixed",
+		fixed = {-5/16, -0.5, -5/16, 5/16, 5/16, 5/16}
+	},
+	selection_box = {
+		type = "fixed",
+		fixed = {-5/16, -0.5, -5/16, 5/16, 5/16, 5/16}
+	},
+})
+
+minetest.register_node("geodes:geode_core", {
+	groups = {not_in_creative_inventory = 1},
+})
+
+minetest.register_ore({
+	ore_type       = "scatter",
+	ore            = "geodes:geode_core",
+	wherein        = "default:stone",
+	clust_scarcity = 64 * 64 * 64,
+	clust_num_ores = 1,
+	clust_size     = 1,
+	y_max          = -40,
+	y_min          = -31000,
+})
+
+minetest.register_ore({
+	ore_type       = "scatter",
+	ore            = "geodes:geode_core",
+	wherein        = "air",
+	clust_scarcity = 64 * 64 * 64,
+	clust_num_ores = 1,
+	clust_size     = 1,
+	y_max          = -40,
+	y_min          = -31000,
+})
+
+minetest.register_lbm({
+        label = "make_geode",
+	name = "geodes:create_geode",
+        nodenames = {"geodes:geode_core"},
+        run_at_every_load = true,
+        action = function(pos, node)
+		
+		if (#geode_types == 0) then
+			minetest.log('THE GEODES MOD REQUIRES AT LEAST ONE MOD THAT ADDS GEODES TO FUNCTION. PLEASE MAKE SURE THAT THE "amethyst_geodes" MOD IS ENABLED, OR ANOTHER MOD THAT USES THE API IS ENABLED.')
+			return
+		end
+
+		local pcgr = PcgRandom(minetest.hash_node_position(pos))
+		local outer, middle, inner, crystal, fill, size_min, size_max = unpack(geode_types[math.random(1, #geode_types)])
+		local size = pcgr:next(size_min, size_max)
+
+		for x = -size, size do
+		for y = -size, size do
+		for z = -size, size do
+		if minetest.get_node(pos + vector.new(x, y, z)).name ~= "air" then
+		if vector.distance(vector.new(x, y, z), vector.new()) < size then
+			minetest.set_node(pos + vector.new(x, y, z), {name = outer})
+		if vector.distance(vector.new(x, y, z), vector.new()) < size - 1 then
+			minetest.set_node(pos + vector.new(x, y, z), {name = middle})
+		if vector.distance(vector.new(x, y, z), vector.new()) < size - 2 then
+			minetest.set_node(pos + vector.new(x, y, z), {name = inner})
+		if vector.distance(vector.new(x, y, z), vector.new()) < size - 3 then
+			minetest.set_node(pos + vector.new(x, y, z), {name = fill})
+		end
+		end
+		end
+		end
+		end
+		end
+		end
+		end
+
+		if crystal ~= fill then
+		for x = -size +4, size -4 do
+		for y = -size +4, size -4 do
+		for z = -size +4, size -4 do
+		if pcgr:next(0, 10) == 0 and vector.distance(vector.new(x, y, z), vector.new()) >= size - 4 and vector.distance(vector.new(x, y, z), vector.new()) < size - 3 then
+
+			if minetest.get_node(pos + vector.new(x, y + 1, z)).name == inner then
+			minetest.set_node(pos + vector.new(x, y, z), {name = crystal, param2 = 0})
+			elseif minetest.get_node(pos + vector.new(x, y - 1, z)).name == inner then
+			minetest.set_node(pos + vector.new(x, y, z), {name = crystal, param2 = 1})
+			elseif minetest.get_node(pos + vector.new(x + 1, y, z)).name == inner then
+			minetest.set_node(pos + vector.new(x, y, z), {name = crystal, param2 = 2})
+			elseif minetest.get_node(pos + vector.new(x - 1, y, z)).name == inner then
+			minetest.set_node(pos + vector.new(x, y, z), {name = crystal, param2 = 3})
+			elseif minetest.get_node(pos + vector.new(x, y, z + 1)).name == inner then
+			minetest.set_node(pos + vector.new(x, y, z), {name = crystal, param2 = 4})
+			elseif minetest.get_node(pos + vector.new(x, y, z - 1)).name == inner then
+			minetest.set_node(pos + vector.new(x, y, z), {name = crystal, param2 = 5})
+			
+			end
+		end
+		end
+		end
+		end
+		end
+
+	end,
+    })
+
+
+function geodes.register_geode(outer, middle, inner, crystal, fill, size_min, size_max)
+	table.insert(geode_types, {outer, middle, inner, crystal or "air", fill or "air", size_min or 6, size_max or 11})
+end