add obsidianbrick

use Zeg9`s texture

mods/default/crafting.lua

@@ -519,6 +519,14 @@ minetest.register_craft({
 	}
 })
 
+minetest.register_craft({
+	output = 'default:obsidian_brick',
+	recipe = {
+		{'default:obsidian', 'default:obsidian'},
+		{'default:obsidian', 'default:obsidian'}
+	}
+})
+
 minetest.register_craft({
 	output = 'default:stonebrick',
 	recipe = {

mods/default/nodes.lua

@@ -1077,6 +1077,14 @@ minetest.register_node("default:obsidian", {
 	groups = {cracky=1,level=2},
 })
 
+minetest.register_node("default:obsidian_brick", {
+	description = "Obsidian Brick",
+	tiles = {"default_obsidian_brick.png"},
+	is_ground_content = true,
+	sounds = default.node_sound_stone_defaults(),
+	groups = {cracky=1,level=2},
+})
+
 minetest.register_node("default:nyancat", {
 	description = "Nyan Cat",
 	tiles = {"default_nc_side.png", "default_nc_side.png", "default_nc_side.png",