Melting point :448.5°
Boiling point :1367°C
Density :8.39
solubility :slightly soluble in alkaline solutions; soluble in acid solutions
form :blue-black crystals
color :blue-black crystals, crystalline
Water Solubility :slightly soluble H2O, alkali hydroxides, sulfides, cyanides; soluble mineral acids [MER06]
Merck :13,9341
crystal system :Three sides
Space group :R3
Solubility Product Constant (Ksp) :pKsp: 20.30
Lattice constant :

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
1.212	1.212	1.8175	90	90	120	2.3121

EPA Substance Registry System :Thallium sulfide (Tl2S) (1314-97-2)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H373 May cause damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 2 Warning P260, P314, P501 H411 Toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 2
Precautionary statements:	P273 Avoid release to the environment. P314 Get medical advice/attention if you feel unwell.