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Strontiomelane

Year of discovery: 1999 (Prabornaz mine, Italy), 1998 (Japan)

Locality list: 2 localities of strontiomelane

• SrMn₈O₁₆
• [Sr²⁺][Mn⁴⁺₆][Mn³⁺₂][O₁₆]^32-

• Class: Cryptomelane group
• Class: Oxide

• Sr => Pb: Coronadite
• Sr => Ba: Hollandite
• Sr => K: Cryptomelane
• Sr => Na: Manjiroite

• Color: Black
• Streak: Dark brown
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Cleavage: Distinct
• Hardness: 4-4.5

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=10.1, b=5.8, c=9.9, β=90.6