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Periclase [abbr. Per ]

Year of discovery: 1841 (Monte Somma, Italy), 1970 (Japan)

Locality list: 3 localities of periclase

• MgO
• [Mg²⁺][O]^2-

• Class: Periclase group
• Class: Oxide
• Soluble in: HCl, HNO₃
• Hydrate to Brucite.

• Mg => Ni: Bunsenite
• Mg => Mn: Manganosite
• Mg => Zn: Zincite
• Mg => Cd: Monteponite
• Mg => Ca: Lime
• Mg => Fe: Wüstite (Wustite)
• Mg => Be: Bromellite
• Mg => Cu: Tenorite
• Mg => Ti: Hongquiite
• Mg => Pd: Palladinite

• Color: Gray, Pale yellow
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {001} (3 planes), Imperfect on {111} (4 planes), Parting on {011} (3 planes)
• Hardness: 5.5
• Density: 3.6

• System: Cubic
• Group: m3m, Fm3m
• Lattice: a=4.2