minetest.register_ore({
	ore_type       = "sheet",
	ore            = "technic:marble",
	wherein        = "air",
	clust_scarcity = 1,
	clust_num_ores = 1,
	clust_size     = 3,
	height_min     = 20,
	height_max     = 500,
	noise_threshhold = 0.5,
    noise_params = {offset=0, scale=1, spread={x=20, y=5, z=20}, seed=23, octaves=3, persist=0.70}
})