diff --git a/nc_crystal/init.lua b/nc_crystal/init.lua
index cfade85..d09fba9 100644
--- a/nc_crystal/init.lua
+++ b/nc_crystal/init.lua
@@ -74,8 +74,8 @@ nodecore.register_limited_abm({
     label = "Lode Crystal growing",
     nodenames = {ore},
     neighbours = {"group:lava"},
-    interval = 20,
-    chance = 20,
+    interval = 60,
+    chance = 30,
     action = function(pos,node)
       local vdirs = {}
       for _,off in pairs(growdirs) do