Screw commit history.

code/game/objects/items/stacks/tiles/tile_mineral.dm

@@ -5,7 +5,7 @@
 	icon_state = "tile_plasma"
 	turf_type = /turf/open/floor/mineral/plasma
 	mineralType = "plasma"
-	materials = list(MAT_PLASMA=500)
+	custom_materials = list(/datum/material/plasma=500)
 
 /obj/item/stack/tile/mineral/uranium
 	name = "uranium tile"
@@ -14,7 +14,7 @@
 	icon_state = "tile_uranium"
 	turf_type = /turf/open/floor/mineral/uranium
 	mineralType = "uranium"
-	materials = list(MAT_URANIUM=500)
+	custom_materials = list(/datum/material/uranium=500)
 
 /obj/item/stack/tile/mineral/gold
 	name = "gold tile"
@@ -23,7 +23,7 @@
 	icon_state = "tile_gold"
 	turf_type = /turf/open/floor/mineral/gold
 	mineralType = "gold"
-	materials = list(MAT_GOLD=500)
+	custom_materials = list(/datum/material/gold=500)
 
 /obj/item/stack/tile/mineral/silver
 	name = "silver tile"
@@ -32,7 +32,7 @@
 	icon_state = "tile_silver"
 	turf_type = /turf/open/floor/mineral/silver
 	mineralType = "silver"
-	materials = list(MAT_SILVER=500)
+	custom_materials = list(/datum/material/silver=500)
 
 /obj/item/stack/tile/mineral/diamond
 	name = "diamond tile"
@@ -41,7 +41,7 @@
 	icon_state = "tile_diamond"
 	turf_type = /turf/open/floor/mineral/diamond
 	mineralType = "diamond"
-	materials = list(MAT_DIAMOND=500)
+	custom_materials = list(/datum/material/diamond=500)
 
 /obj/item/stack/tile/mineral/bananium
 	name = "bananium tile"
@@ -50,7 +50,7 @@
 	icon_state = "tile_bananium"
 	turf_type = /turf/open/floor/mineral/bananium
 	mineralType = "bananium"
-	materials = list(MAT_BANANIUM=500)
+	custom_materials = list(/datum/material/bananium=500)
 
 /obj/item/stack/tile/mineral/abductor
 	name = "alien floor tile"
@@ -68,7 +68,7 @@
 	icon_state = "tile_shuttle"
 	turf_type = /turf/open/floor/mineral/titanium
 	mineralType = "titanium"
-	materials = list(MAT_TITANIUM=500)
+	custom_materials = list(/datum/material/titanium=500)
 
 /obj/item/stack/tile/mineral/plastitanium
 	name = "plastitanium tile"
@@ -77,4 +77,5 @@
 	icon_state = "tile_darkshuttle"
 	turf_type = /turf/open/floor/mineral/plastitanium
 	mineralType = "plastitanium"
-	materials = list(MAT_TITANIUM=250, MAT_PLASMA=250)
+	custom_materials = list(/datum/material/titanium=250, /datum/material/plasma=250)
+	material_flags = MATERIAL_NO_EFFECTS

code/game/objects/items/stacks/tiles/tile_types.dm

@@ -9,6 +9,7 @@
 	throw_speed = 3
 	throw_range = 7
 	max_amount = 60
+	mats_per_stack = 500
 	var/turf_type = null
 	var/mineralType = null
 	novariants = TRUE
@@ -434,7 +435,7 @@
 	desc = "Those could work as a pretty decent throwing weapon."
 	icon_state = "tile"
 	force = 6
-	materials = list(MAT_METAL=500)
+	custom_materials = list(/datum/material/iron=500)
 	throwforce = 10
 	flags_1 = CONDUCT_1
 	turf_type = /turf/open/floor/plasteel
@@ -444,6 +445,6 @@
 
 /obj/item/stack/tile/plasteel/cyborg
 	desc = "The ground you walk on." //Not the usual floor tile desc as that refers to throwing, Cyborgs can't do that - RR
-	materials = list() // All other Borg versions of items have no Metal or Glass - RR
+	custom_materials = null // All other Borg versions of items have no Metal or Glass - RR
 	is_cyborg = 1
 	cost = 125