Abelsonite

Formula: C₃₁H₃₂N₄Ni

Origin of name: After Philip Hauge Abelson, American scientist, president Carnegie Institution of Washington

Crystal system: Triclinic

Crystal class: 1 or -1

Twinning:

Unit cell: a = 8.44 Å, b = 11.12 Å, c = 7.28 Å, a = 90.83°, b = 113.75°, g = 79.567°

Colour: Pink to purple to reddish brown 

Diaphaneity: Translucent

Luster: Adamantine, semimetallic

Habit: Crystals platy in aggregates

Hardness: 3

Specific gravity: 1.4

Cleavage: 1; {1-11} possibly

Tenacity:

Streak:

Synonyms/varieties:

Comments: Found in fractures in lacusterine, kerogen-rich shales