rock dust (#8741)

code/modules/mining/mine_turfs.dm

@@ -391,6 +391,17 @@ var/list/mineral_can_smooth_with = list(
 			DropMineral()
 
 	//Add some rubble, you did just clear out a big chunk of rock.
+
+	if(prob(25))
+		var/datum/reagents/R = new/datum/reagents(20)
+		R.my_atom = src
+		R.add_reagent("stone_dust",20)
+		var/datum/effect/effect/system/smoke_spread/chem/S = new("stone_dust")
+		S.show_log = 0
+		S.set_up(R, 10, 0, src, 40)
+		S.start()
+		qdel(R)
+
 	ChangeTurf(mined_turf)
 
 	if(rand(1,500) == 1)

code/modules/reagents/Chemistry-Reagents/Chemistry-Reagents-Other.dm

@@ -854,3 +854,20 @@
 /datum/reagent/bottle_lightning/affect_blood(var/mob/living/carbon/M, var/alien, var/removed)
 	if(prob(25))
 		tesla_zap(M, 6, 1500)
+
+/datum/reagent/stone_dust
+	name = "Stone Dust"
+	id = "stone_dust"
+	description = "Crystalline silica dust, harmful when inhaled."
+	reagent_state = SOLID
+	color = "#5a4d41"
+	taste_description = "dust"
+	specific_heat = 1
+
+/datum/reagent/stone_dust/affect_breathe(var/mob/living/carbon/human/H, var/alien, var/removed)
+	. = ..()
+	if(istype(H))
+		if(prob(15))
+			var/obj/item/organ/L = H.internal_organs_by_name[BP_LUNGS]
+			if(istype(L) && !L.robotic)
+				L.take_damage(0.5*removed)