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Ramsdellite (Photo)

Year of discovery: 1943 (Lake Valley district, USA), 1956 (Japan)

Locality list: 25 localities of ramsdellite

• MnO₂
• γ-[Mn⁴⁺][O₂]^4-

• Class: Oxide

• Polymorph: Pyrolusite (β, Tetragonal), Akhtenskite (ε, Hexagonal)

• 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: Dark gray, Black
• Streak: Black, Brownish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Bipyramidal, Prismatic

• Cleavage: Good (4 planes)
• Hardness: 3
• Density: 4.4

• System: Orthorhombic
• Group: mmm, Pbnm
• Lattice: a=4.5, b=9.3, c=2.9