Formula: (Fe,Ni)9S8
Origin of name: for J. Pentland, Irish scientist
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell: a = 10.04 Å
Colour: light bronze-yellow
Diaphaneity: opaque
Luster: metallic
Habit: massive, granular
Hardness: 3.5 to 4
Specific gravity: 4.6 to 5.0
Cleavage: 1; {111} parting
Tenacity: conchoidal, brittle
Streak: bronze brown
Synonyms/varieties:
Comments: series with cobalt pentlandite
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