diff --git a/src/simulation/elements/ACID.cpp b/src/simulation/elements/ACID.cpp
index 499476c97..a0707bac5 100644
--- a/src/simulation/elements/ACID.cpp
+++ b/src/simulation/elements/ACID.cpp
@@ -89,7 +89,16 @@ static int update(UPDATE_FUNC_ARGS)
 							}
 							parts[i].temp += newtemp;
 							parts[i].life--;
-							sim->kill_part(ID(r));
+							switch (rt)
+							{
+							case PT_LITH:
+								sim->part_change_type(ID(r), x + rx, y + ry, PT_H2);
+								break;
+
+							default:
+								sim->kill_part(ID(r));
+								break;
+							}
 						}
 					}
 					else if (parts[i].life<=50)
diff --git a/src/simulation/elements/LITH.cpp b/src/simulation/elements/LITH.cpp
new file mode 100644
index 000000000..b05088a69
--- /dev/null
+++ b/src/simulation/elements/LITH.cpp
@@ -0,0 +1,253 @@
+#include "simulation/ElementCommon.h"
+
+static int update(UPDATE_FUNC_ARGS);
+static int graphics(GRAPHICS_FUNC_ARGS);
+
+void Element::Element_LITH()
+{
+	Identifier = "DEFAULT_PT_LITH";
+	Name = "LITH";
+	Colour = PIXPACK(0xC0C0C0);
+	MenuVisible = 1;
+	MenuSection = SC_EXPLOSIVE;
+	Enabled = 1;
+
+	Advection = 0.2f;
+	AirDrag = 0.01f * CFDS;
+	AirLoss = 0.96f;
+	Loss = 0.95f;
+	Collision = -0.1f;
+	Gravity = 0.2f;
+	Diffusion = 0.00f;
+	HotAir = 0.000f	* CFDS;
+	Falldown = 1;
+
+	Flammable = 0;
+	Explosive = 0;
+	Meltable = 0;
+	Hardness = 15;
+
+	Weight = 17;
+
+	HeatConduct = 70;
+	Description = "Lithium. Reactive element that explodes on contact with water.";
+
+	Properties = TYPE_PART | PROP_LIFE_DEC;
+
+	LowPressure = IPL;
+	LowPressureTransition = NT;
+	HighPressure = IPH;
+	HighPressureTransition = NT;
+	LowTemperature = ITL;
+	LowTemperatureTransition = NT;
+	HighTemperature = 453.65f;
+	HighTemperatureTransition = PT_LAVA;
+
+	Update = &update;
+	Graphics = &graphics;
+}
+
+/*
+
+tmp2:  carbonation factor
+life:  burn timer above 1000, spark cooldown timer otherwise
+tmp:   hydrogenation factor
+ctype: absorbed energy
+
+For game reasons, baseline LITH has the reactions of both its pure form and
+its hydroxide, and also has basic li-ion battery-like behavior.
+It absorbs CO2 like its hydroxide form, but can only be converted into GLAS
+after having absorbed CO2.
+
+If LITH comes in contact with water, it will consume 1 WATR, increment tmp,
+and heat itself up by 400K. At 1000K it bursts into flames and sets tmp to 10
+if still in contact with WATR, setting its life to 24 and insta-boiling
+water in its immediate vincity.
+
+*/
+
+static int update(UPDATE_FUNC_ARGS)
+{
+	Particle &self = parts[i];
+
+	int &hydrogenationFactor = self.tmp;
+	int &burnTimer = self.life;
+	int &carbonationFactor = self.tmp2;
+	int &storedEnergy = self.ctype;
+	if (storedEnergy < 0)
+	{
+		storedEnergy = 0;
+	}
+
+	bool charged = false;
+	bool discharged = false;
+	for (int rx = -2; rx <= 2; ++rx)
+	{
+		for (int ry = -2; ry <= 2; ++ry)
+		{
+			if (BOUNDS_CHECK && (rx || ry))
+			{
+				int neighborData = pmap[y + ry][x + rx];
+				if (!neighborData)
+				{
+					if (burnTimer > 1012 && RNG::Ref().chance(1, 10))
+					{
+						sim->create_part(-1, x + rx, y + ry, PT_FIRE);
+					}
+					continue;
+				}
+				Particle &neighbor = parts[ID(neighborData)];
+
+				switch (TYP(neighborData))
+				{
+				case PT_SLTW:
+				case PT_WTRV:
+				case PT_WATR:
+				case PT_DSTW:
+				case PT_CBNW:
+					if (burnTimer > 1016)
+					{
+						sim->part_change_type(ID(neighborData), x + rx, y + ry, PT_WTRV);
+						neighbor.temp = 440.f;
+						continue;
+					}
+					if (hydrogenationFactor + carbonationFactor >= 10)
+					{
+						continue;
+					}
+					if (self.temp > 440.f)
+					{
+						burnTimer = 1024 + (storedEnergy > 24 ? 24 : storedEnergy);
+						sim->part_change_type(ID(neighborData), x + rx, y + ry, PT_H2);
+						hydrogenationFactor = 10;
+					}
+					else
+					{
+						self.temp = restrict_flt(self.temp + 20.365f + storedEnergy * storedEnergy * 1.5f, MIN_TEMP, MAX_TEMP);
+						sim->part_change_type(ID(neighborData), x + rx, y + ry, PT_H2);
+						hydrogenationFactor += 1;
+					}
+					break;
+
+				case PT_CO2:
+					if (hydrogenationFactor + carbonationFactor >= 10)
+					{
+						continue;
+					}
+					sim->kill_part(ID(neighborData));
+					carbonationFactor += 1;
+					break;
+
+				case PT_SPRK:
+					if (hydrogenationFactor + carbonationFactor >= 5)
+					{
+						continue; // too impure to do battery things.
+					}
+					if (neighbor.ctype == PT_PSCN && neighbor.life == 3 && !charged && !burnTimer)
+					{
+						charged = true;
+					}
+					break;
+
+				case PT_NSCN:
+					if (neighbor.life == 0 && storedEnergy > 0 && !burnTimer)
+					{
+						sim->part_change_type(ID(neighborData), x + rx, y + ry, PT_SPRK);
+						neighbor.life = 4;
+						neighbor.ctype = PT_NSCN;
+						discharged = true;
+					}
+					break;
+
+				case PT_FIRE:
+					if (self.temp > 440.f && RNG::Ref().chance(1, 40) && hydrogenationFactor < 6)
+					{
+						burnTimer = 1013;
+						hydrogenationFactor += 1;
+					}
+					break;
+
+				case PT_O2:
+					if (burnTimer > 1000 && RNG::Ref().chance(1, 10))
+					{
+						sim->part_change_type(i, x, y, PT_PLSM);
+						sim->part_change_type(ID(neighborData), x + rx, y + ry, PT_PLSM);
+						sim->pv[y / CELL][x / CELL] += 4.0;
+					}						
+					return 0;
+				}
+			}
+		}
+	}
+	if (charged)
+	{
+		storedEnergy += 1;
+		burnTimer = 8;
+	}
+	if (discharged)
+	{
+		storedEnergy -= 1;
+		burnTimer = 8;
+	}
+
+	for (int trade = 0; trade < 9; ++trade)
+	{
+		int rx = RNG::Ref().between(-3, 3);
+		int ry = RNG::Ref().between(-3, 3);
+		if (BOUNDS_CHECK && (rx || ry))
+		{
+			int neighborData = pmap[y + ry][x + rx];
+			if (TYP(neighborData) != PT_LITH)
+			{
+				continue;
+			}
+			Particle &neighbor = parts[ID(neighborData)];
+
+			int &neighborStoredEnergy = neighbor.ctype;
+			if (storedEnergy > neighborStoredEnergy)
+			{
+				int transfer = storedEnergy - neighborStoredEnergy;
+				transfer -= transfer / 2;
+				neighborStoredEnergy += transfer;
+				storedEnergy -= transfer;
+				break;
+			}
+		}
+	}
+	if (self.temp > 440.f && burnTimer == 1000)
+	{
+		sim->part_change_type(i, x, y, PT_LAVA);
+		if (carbonationFactor < 3)
+		{
+			self.temp = 500.f;
+			self.ctype = PT_LITH;
+		}
+		else
+		{
+			self.temp = 2000.f;
+			self.ctype = PT_GLAS;
+		}
+	}
+	return 0;
+}
+
+static int graphics(GRAPHICS_FUNC_ARGS)
+{
+	if (cpart->life >= 1000)
+	{
+		int colour = 0xFFA040;
+		*colr = PIXR(colour);
+		*colg = PIXG(colour);
+		*colb = PIXB(colour);
+		*pixel_mode |= PMODE_FLARE | PMODE_GLOW;
+	}
+	else if (cpart->ctype && RNG::Ref().chance(cpart->ctype, 100))
+	{
+		int colour = 0x50A0FF;
+		*colr = PIXR(colour);
+		*colg = PIXG(colour);
+		*colb = PIXB(colour);
+		*pixel_mode |= PMODE_FLARE | PMODE_GLOW;
+	}
+	return 0;
+}
diff --git a/src/simulation/elements/meson.build b/src/simulation/elements/meson.build
index 9f981eea6..ff6f0a61a 100644
--- a/src/simulation/elements/meson.build
+++ b/src/simulation/elements/meson.build
@@ -190,6 +190,7 @@ simulation_elem_ids = [
 	[ 'PTNM',   188 ],
 	[ 'VSNS',   189 ],
 	[ 'ROCK',   190 ],
+	[ 'LITH',   191 ],
 ]
 
 simulation_elem_src = []