diff --git a/rocks/ign.lua b/rocks/ign.lua
index 587b707..fbbea4c 100644
--- a/rocks/ign.lua
+++ b/rocks/ign.lua
@@ -68,7 +68,7 @@ local regv=function(name,param)
    ore_type       = "blob",
    clust_scarcity = param.rarity^3,
    clust_num_ores = 8,
-   clust_size     = 10*2,
+   clust_size     = param.radius.average*2,
    height_min     = -31000,
    height_max     = 50,
    noise_threshhold = 0.5, --< determined experimentally
diff --git a/rocks/pegmatite.lua b/rocks/pegmatite.lua
index e5e9bf8..e0224da 100644
--- a/rocks/pegmatite.lua
+++ b/rocks/pegmatite.lua
@@ -2,9 +2,7 @@
 -- Pegmatite vein
 --
 
-local CommonRarity=0.024
-local CommonRadius=8
-local CommonWherein={ "rocks:granite" }
+local CommonRarity=32
 
 minetest.register_node( "rocks:pegmatite", {
 	description = S("Pegmatite"),
@@ -30,7 +28,7 @@ minetest.register_node( "rocks:pegmatite", {
 rocks.register_vein("rocks:pegmatite",{
   wherein={ "rocks:granite" },
   miny=-160, maxy=20,
-  radius={ average=8, amplitude=4, frequency=5 },
+  radius={ average=14, amplitude=0.3, frequency=16 },
   density=80, rarity=CommonRarity,
   ores={
   }