diff --git a/src/simulation/Simulation.cpp b/src/simulation/Simulation.cpp
index c738fce39..499748d6c 100644
--- a/src/simulation/Simulation.cpp
+++ b/src/simulation/Simulation.cpp
@@ -4001,6 +4001,9 @@ void Simulation::update_particles_i(int start, int inc)
 							if (parts[i].ctype>0 && parts[i].ctype<PT_NUM && parts[i].ctype!=PT_LAVA) {
 								if (parts[i].ctype==PT_THRM&&pt>=elements[PT_BMTL].HighTemperature) s = 0;
 								else if ((parts[i].ctype==PT_VIBR || parts[i].ctype==PT_BVBR) && pt>=273.15f) s = 0;
+								else if (parts[i].ctype==PT_TUGN) {
+									if (pt>3695.0) s = 0;
+								}
 								else if (elements[parts[i].ctype].HighTemperatureTransition==PT_LAVA) {
 									if (pt>=elements[parts[i].ctype].HighTemperature) s = 0;
 								}
diff --git a/src/simulation/elements/LAVA.cpp b/src/simulation/elements/LAVA.cpp
index 062dcf817..b52c61ec1 100644
--- a/src/simulation/elements/LAVA.cpp
+++ b/src/simulation/elements/LAVA.cpp
@@ -37,7 +37,7 @@ Element_LAVA::Element_LAVA()
 	LowPressureTransition = NT;
 	HighPressure = IPH;
 	HighPressureTransition = NT;
-	LowTemperature = 2573.15f;
+	LowTemperature = 3695.0f;// Highest temperature at which any type of lava can solidify
 	LowTemperatureTransition = ST;
 	HighTemperature = ITH;
 	HighTemperatureTransition = NT;
@@ -68,4 +68,4 @@ int Element_LAVA::graphics(GRAPHICS_FUNC_ARGS)
 }
 
 
-Element_LAVA::~Element_LAVA() {}
\ No newline at end of file
+Element_LAVA::~Element_LAVA() {}
diff --git a/src/simulation/elements/TUGN.cpp b/src/simulation/elements/TUGN.cpp
index 2c2c2369c..f70037b30 100644
--- a/src/simulation/elements/TUGN.cpp
+++ b/src/simulation/elements/TUGN.cpp
@@ -40,7 +40,7 @@ Element_TUGN::Element_TUGN()
 	HighPressureTransition = NT;
 	LowTemperature = ITL;
 	LowTemperatureTransition = NT;
-	HighTemperature = ITL;
+	HighTemperature = ITH;
 	HighTemperatureTransition = NT;
 	/*HighTemperature = 3895.0f;
 	HighTemperatureTransition = PT_LAVA;*/