Formula: Hg3S2(Cl,Br)2
Origin of name: Named for Michail Alexeevich Lavrentiev (1900-1980), Russian mathematician and academician, founder of the Siberian Academy of Science.
Crystal system: Monoclinic or triclinic
Crystal class: 2 or m or 2/m
Twinning:
Unit cell: a = 8.94, b = 5.194, c = 18.33, β = 92.73°
Colour: Colourless to yellow
Diaphaneity: Transparent
Luster: Vitreous to adamantine
Habit: Complex intergrowths to 0.2 mm
Hardness: 2 to 2.5
Specific gravity: 7.26
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with arzakite; dimorphous with corderoite
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