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Efremovite

Year of discovery: 1989 (Coal mine no.43, Kopeisk, Russia), 2010 (Japan)

Locality list: A locality of efremovite

• (NH₄)₂Mg₂(SO₄)₃
• [(NH₄)⁺₂][Mg²⁺₂][(SO₄)₃]^6-

• Class: Ammonium - Sulfate
• Hydrate to Boussingaultite under ambient condition.

• NH₄ => K: Langbeinite

• Color: Grayish white, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Cleavage: No
• Hardness: 2
• Density: 2.5

• System: Cubic
• Group: 23, P2₁3
• Lattice: a=10.0