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Akhtenskite

Year of discovery: 1982 (Akhtenskoe deposit, Russia), 2002 (Japan)

Locality list: 6 localities of akhtenskite

• MnO₂
• ε-[Mn⁴⁺][O₂]^4-

• Class: Oxide

• Polymorph: Pyrolusite (β, Tetragonal), Ramsdellite (γ, Orthorhombic)

• Mn => Ge: Argutite
• Mn => Sn: Cassiterite
• Mn => Ti: Rutile, Anatase, Brookite
• Mn => Pb: Scrutinyite (α), Plattnerite
• Mn => Si: Quartz (α), β-Quartz (β), Tridymite, Cristobalite, Coesite, Stishovite, Mogánite (Moganite)
• Mn => V: Paramontroseite
• Mn => Mo: Tugarinovite
• Mn => U: Uraninite
• Mn => Th: Thorianite
• Mn => Ce: Cerianite-(Ce)
• Mn => Se: Downeyite
• Mn => Zr: Baddeleyite
• Mn => Te: Tellurite, Paratellurite

• Color: Gray-Black
• Streak: Black
• Diaphaneity: Opaque

• Cleavage: Distinct on {001} (1 plane)
• Density: 4.8

• System: Hexagonal
• Group: 6/mmm, P6₃/mmc
• Lattice: a=2.8, c=4.6