Changed Mese object to be more consistent with other ores (see below).

Added textures for mese mineral, lump, ingot, block.  Block uses a variant of
the old black-on-yellow mese texture.

Changed name of primary mese object in game to be mese mineral rather than a
mese block; changed name of this object to "default:stone_with_mese" and
aliased "default:mese" back to that to avoid breaking old maps.

Made this mese mineral drop a single mese lump when mined.  Smelt one of these
into a mese ingot (same cook time as iron lump -> steel ingot).

Changed the mese pick recipe in default to use "default:mese_ingot" instead.

Changed the mese-as-a-fuel recipe to use "default:mese_lump".

Added recipe to craft mese block ("default:meseblock") from 9 mese ingots, and
to craft it back to same.

Added recipe to craft mese mineral out of one mese lump and one block of stone
for backward compatibility with old mods that depended on the original mese
object.

mods/default/init.lua

@@ -259,7 +259,7 @@ minetest.register_craft({
 minetest.register_craft({
 	output = 'default:pick_mese',
 	recipe = {
-		{'default:mese', 'default:mese', 'default:mese'},
+		{'default:mese_ingot', 'default:mese_ingot', 'default:mese_ingot'},
 		{'', 'default:stick', ''},
 		{'', 'default:stick', ''},
 	}
@@ -470,6 +470,32 @@ minetest.register_craft({
 	}
 })
 
+minetest.register_craft({
+	output = 'default:meseblock',
+	recipe = {
+		{'default:mese_ingot', 'default:mese_ingot', 'default:mese_ingot'},
+		{'default:mese_ingot', 'default:mese_ingot', 'default:mese_ingot'},
+		{'default:mese_ingot', 'default:mese_ingot', 'default:mese_ingot'},
+	}
+})
+
+minetest.register_craft({
+	output = 'default:mese_ingot 9',
+	recipe = {
+		{'default:meseblock'},
+	}
+})
+
+minetest.register_craft({
+	type = "shapeless",
+	output = 'default:stone_with_mese',
+	recipe = {
+		'default:mese_lump',
+		'default:stone',
+	}
+})
+
+
 --
 -- Crafting (tool repair)
 --
@@ -500,6 +526,12 @@ minetest.register_craft({
 	recipe = "default:iron_lump",
 })
 
+minetest.register_craft({
+	type = "cooking",
+	output = "default:mese_ingot",
+	recipe = "default:mese_lump"
+})
+
 minetest.register_craft({
 	type = "cooking",
 	output = "default:clay_brick",
@@ -566,7 +598,7 @@ minetest.register_craft({
 
 minetest.register_craft({
 	type = "fuel",
-	recipe = "default:mese",
+	recipe = "default:mese_lump",
 	burntime = 30,
 })
 
@@ -745,6 +777,17 @@ minetest.register_node("default:stone_with_iron", {
 	sounds = default.node_sound_stone_defaults(),
 })
 
+minetest.register_node("default:stone_with_mese", {
+	description = "Mese Ore",
+	tiles = {"default_stone.png^default_mineral_mese.png"},
+	is_ground_content = true,
+	groups = {cracky=1},
+	drop = "default:mese_lump",
+	sounds = default.node_sound_defaults(),
+})
+
+minetest.register_alias("default:mese", "default:stone_with_mese")
+
 minetest.register_node("default:dirt_with_grass", {
 	description = "Dirt with Grass",
 	tiles = {"default_grass.png", "default_dirt.png", "default_dirt.png^default_grass_side.png"},
@@ -990,14 +1033,6 @@ minetest.register_node("default:wood", {
 	sounds = default.node_sound_wood_defaults(),
 })
 
-minetest.register_node("default:mese", {
-	description = "Mese",
-	tiles = {"default_mese.png"},
-	is_ground_content = true,
-	groups = {cracky=1},
-	sounds = default.node_sound_defaults(),
-})
-
 minetest.register_node("default:cloud", {
 	description = "Cloud",
 	tiles = {"default_cloud.png"},
@@ -1515,6 +1550,14 @@ minetest.register_node("default:steelblock", {
 	sounds = default.node_sound_stone_defaults(),
 })
 
+minetest.register_node("default:meseblock", {
+	description = "Mese Block",
+	tiles = {"default_mese_block.png"},
+	is_ground_content = true,
+	groups = {cracky=1},
+	sounds = default.node_sound_defaults(),
+})
+
 minetest.register_node("default:nyancat", {
 	description = "Nyan Cat",
 	tiles = {"default_nc_side.png", "default_nc_side.png", "default_nc_side.png",
@@ -1613,6 +1656,11 @@ minetest.register_craftitem("default:iron_lump", {
 	inventory_image = "default_iron_lump.png",
 })
 
+minetest.register_craftitem("default:mese_lump", {
+	description = "Mese Lump",
+	inventory_image = "default_mese_lump.png",
+})
+
 minetest.register_craftitem("default:clay_lump", {
 	description = "Clay Lump",
 	inventory_image = "default_clay_lump.png",
@@ -1623,6 +1671,11 @@ minetest.register_craftitem("default:steel_ingot", {
 	inventory_image = "default_steel_ingot.png",
 })
 
+minetest.register_craftitem("default:mese_ingot", {
+	description = "Mese Ingot",
+	inventory_image = "default_mese_ingot.png",
+})
+
 minetest.register_craftitem("default:clay_brick", {
 	description = "Clay Brick",
 	inventory_image = "default_steel_ingot.png",