minetest.register_ore({
    ore_type       = "scatter",
    ore            = "moontest:lightore",
    wherein        = "moontest:stone",
    clust_scarcity = 10*10*10,
    clust_num_ores = 6,
    clust_size     = 5,
    height_min     = -31000,
    height_max     = 5,
})