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Langbeinite

Year of discovery: 1891 (Wilhelmshall, Germany), 1987 (Japan)

Locality list: A locality of langbeinite

• K₂Mg₂(SO₄)₃
• [K⁺₂][Mg²⁺₂][(SO₄)₃]^6-

• Class: Sulfate
• Fluorescence: Phosphorescence
• Electrical: Piezoelectric

• K = NH₄: Efremovite

• Color: Colorless, Purple, Green, Pale yellow
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: No
• Hardness: 3.5-4
• Density: 2.8

• System: Cubic
• Group: 23, P2₁3
• Lattice: a=9.9