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Donpeacorite

Year of discovery: 1984 (ZCA no.4 mine (St Joe mine), USA), 1986 (Japan)

Locality list: A locality of donpeacorite

• MnMgSi₂O₆
• (Mn,Mg)MgSi₂O₆
• [Mn²⁺][Mg²⁺][(SiO₃)₂]^4-

• Class: Pyroxene supergroup
• Class: Inosilicate (Single chain)

• Polymorph: Kanoite (Monoclinic)

• Mn => Mg: Clinoenstatite, Enstatite, Akimotoite

• Mg => Ca: Johannsenite
• Mg => Na: Namansilite

• Si => Ti: Geikielite

• Color: Yellowish brown
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {110} (2 planes, 90 degree)
• Hardness: 5-6
• Density: 3.4

• System: Orthorhombic
• Group: mmm, Pbca
• Lattice: a=18.4, b=8.9, c=5.2