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Arcanite

Year of discovery: 1845 (Santa Ana mine, USA), 1963 (Japan)

Locality list: A locality of arcanite

• K₂SO₄
• [K⁺₂][SO₄]^2-

• Class: Sulfate
• Radioactive: Moderate

• K => NH₄: Mascagnite (Series)

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Distinct on {010} and {001} (2 planes)
• Hardness: 2
• Density: 2.7

• System: Orthorhombic
• Group: mmm, Pmcn
• Lattice: a=5.8, b=10.1, c=7.4