Add Skarn deposits.

init.lua

@@ -21,6 +21,7 @@ local modpath=minetest.get_modpath(minetest.get_current_modname())
 dofile(modpath.."/mapgen.lua")
 dofile(modpath.."/sed.lua")
 dofile(modpath.."/ign.lua")
+dofile(modpath.."/skarn.lua")
 
 minetest.register_on_mapgen_init(function(mapgen_params)
  -- todo: disable caves and ores

skarn.lua

@@ -0,0 +1,128 @@
+--
+-- Skarn deposit
+--
+
+local CommonRarity=0.02
+local CommonRadius=10
+
+minetest.register_node( "rocks:skarn", {  
+	description = S("Skarn"),
+	tiles = { "rocks_Skarn.png" },
+	groups = {cracky=3, stone=1}, 
+	is_ground_content = true, sounds = default.node_sound_stone_defaults(),
+})
+
+-- ores have to be redefined for skarn background
+
+   -- There is also a chance of isolated lapis crystals
+   -- enrichments: scheelite and wollastonite  -> in each vein
+
+-- Chalcopyrite
+minetest.register_node( "rocks:skarn_chalcopyrite", {  
+	description = S("Chalcopyrite"),
+	tiles = { "rocks_Skarn.png^rocks_Chalcopyrite.png" },
+	groups = {cracky=3}, 
+	is_ground_content = true, sounds = default.node_sound_stone_defaults(),
+})
+-- Malachyte
+minetest.register_node( "rocks:skarn_malachyte", {  
+	description = S("Malachyte"),
+	tiles = { "rocks_Skarn.png^rocks_Chalcopyrite.png" },
+	groups = {cracky=3}, 
+	is_ground_content = true, sounds = default.node_sound_stone_defaults(),
+})
+-- Chalcopyrite/Malachyte skarn mix
+rocks.register_vein("rocks:skarn",{
+  wherein="rocks:granite",
+  miny=-160, maxy=20,
+  radius={ average=CommonRadius, amplitude=3, frequency=5 },
+  density=80, rarity=CommonRarity,
+  ores={
+   -- marble and hornfels, as well as unchanged limestone.
+   -- { ore="rocks:marble", percent=10 },
+   -- { ore="rocks:hornfels", percent=10 },
+    { ore="rocks:skarn_chalcopyrite", percent=30 },
+    { ore="rocks:skarn_malachyte", percent=15 },
+  }
+ })
+
+-- Sphalerite
+minetest.register_node( "rocks:skarn_sphalerite", {  
+	description = S("Sphalerite"),
+	tiles = { "rocks_Skarn.png^rocks_sphalerite.png" },
+	groups = {cracky=3}, 
+	is_ground_content = true, sounds = default.node_sound_stone_defaults(),
+})
+-- Galena
+minetest.register_node( "rocks:skarn_galena", {  
+	description = S("Galena"),
+	tiles = { "rocks_Skarn.png^rocks_galena.png" },
+	groups = {cracky=3}, 
+	is_ground_content = true, sounds = default.node_sound_stone_defaults(),
+})
+-- Pb Zn skarn mix
+rocks.register_vein("rocks:skarn",{
+  wherein="rocks:granite",
+  miny=-160, maxy=20,
+  radius={ average=CommonRadius, amplitude=3, frequency=5 },
+  density=80, rarity=CommonRarity,
+  ores={
+   -- marble and hornfels, as well as unchanged limestone.
+   -- { ore="rocks:marble", percent=10 },
+   -- { ore="rocks:hornfels", percent=10 },
+    { ore="rocks:skarn_galena", percent=25 },
+    { ore="rocks:skarn_sphalerite", percent=25 },
+  }
+ })
+
+-- Magnetite
+minetest.register_node( "rocks:skarn_magnetite", {  
+	description = S("Magnetite"),
+	tiles = { "rocks_Skarn.png^rocks_Magnetite.png" },
+	groups = {cracky=3}, 
+	is_ground_content = true, sounds = default.node_sound_stone_defaults(),
+})
+-- Fe skarn mix
+rocks.register_vein("rocks:skarn",{
+  wherein="rocks:granite",
+  miny=-160, maxy=20,
+  radius={ average=CommonRadius, amplitude=3, frequency=5 },
+  density=80, rarity=CommonRarity,
+  ores={
+   -- marble and hornfels, as well as unchanged limestone.
+   -- { ore="rocks:marble", percent=10 },
+   -- { ore="rocks:hornfels", percent=10 },
+    { ore="rocks:skarn_magnetite", percent=40 },
+  }
+ })
+
+-- Magnesite
+minetest.register_node( "rocks:skarn_magnesite", {
+	description = S("Magnesite"),
+	tiles = { "rocks_Skarn.png^rocks_Magnesite.png" },
+	groups = {cracky=3}, 
+	is_ground_content = true, sounds = default.node_sound_stone_defaults(),
+})
+-- Vermiculite (fixme: move to CommonRocks)
+minetest.register_node( "rocks:vermiculite", {
+	description = S("Vermiculite"),
+	tiles = { "rocks_Vermiculite.png" },
+	groups = {crumbly=3}, 
+	is_ground_content = true, sounds = default.node_sound_stone_defaults(),
+})
+-- magnesite/vermiculite skarn mix
+rocks.register_vein("rocks:skarn",{
+  wherein="rocks:granite",
+  miny=-160, maxy=20,
+  radius={ average=CommonRadius, amplitude=3, frequency=5 },
+  density=80, rarity=CommonRarity,
+  ores={
+   -- marble and hornfels, as well as unchanged limestone.
+   -- { ore="rocks:marble", percent=10 },
+   -- { ore="rocks:hornfels", percent=10 },
+    { ore="rocks:skarn_magnesite", percent=30 },
+    { ore="rocks:vermiculite", percent=20 },
+  }
+ })
+
+-- ~ Tomas Brod