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Mackinawite

Year of discovery: 1962 (Mackinaw mine (Weden Creek mine), USA), 1948 (Japan)

Locality list: 81 localities of mackinawite

• Fe₉S₈
• (Fe,Ni)₉S₈
• [Fe²⁺₉][S₈]

• Class: Sulfide

• Polymorph: Pentlandite (Cubic)

• Fe => Ni: Godlevskite
• Fe => Co: Cobaltpentlandite

• Fe₉ => AgFe₈: Argentopentlandite
• Fe₉ => PbFe₈: Shadlunite
• Fe₉ => MnFe₈: Manganoshadlunite
• Fe₉ => CuFe₈: Sugakiite

• Color: Reddish brown
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Thin tabular

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2.5
• Density: 4.3

• System: Tetragonal
• Group: 4/mmm, P4/nmm
• Lattice: a=3.7, c=5.0

Etymology: Mackinaw mine in Washington state, USA