Aleksite

Aleksite (IMA symbol: Alk^[1]) is a rare lead bismuth tellurium sulfosalt mineral with formula PbBi₂Te₂S₂.^[2][3][4]

Aleksite
Alkesite on matrix
General
Category	sulfosalt mineral
Formula	PbBi2Te2S2
Crystal system	Trigonal
Crystal class	3m
Space group	P3m1 (no. 164)
Identification
Mohs scale hardness	2.5
Luster	metallic
Streak	pale green
Specific gravity	7.80