Default: Add 'silver sand' for cold desert biome

mods/default/README.txt

@@ -111,6 +111,7 @@ paramat (CC BY-SA 3.0):
   default_grass.png
   default_grass_side.png
   default_mese_block.png
+  default_silver_sand.png
 
 brunob.santos (CC BY-SA 4.0):
   default_desert_cobble.png

mods/default/nodes.lua

@@ -47,6 +47,7 @@ default:dirt_with_snow
 
 default:sand
 default:desert_sand
+default:silver_sand
 
 default:gravel
 
@@ -390,6 +391,13 @@ minetest.register_node("default:desert_sand", {
 	sounds = default.node_sound_sand_defaults(),
 })
 
+minetest.register_node("default:silver_sand", {
+	description = "Silver Sand",
+	tiles = {"default_silver_sand.png"},
+	groups = {crumbly = 3, falling_node = 1, sand = 1},
+	sounds = default.node_sound_sand_defaults(),
+})
+
 
 minetest.register_node("default:gravel", {
 	description = "Gravel",