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Pickeringite

Year of discovery: 1844 (Cerros Pintados, Chile), 1947 (Japan)

Locality list: 14 localities of pickeringite

• MgAl₂(SO₄)₄,22H₂O
• [Mg(H₂O)₅²⁺][Al(H₂O)₆³⁺]₂[(SO₄)₄]^8-,5H₂O

• Class: Halotrichite group
• Class: Sulfate - Hydrate
• Soluble in: Water

• Mg => Fe: Halotrichite (Series)
• Mg => Mn: Apjohnite (Partial Series)
• Mg => Zn: Dietrichite
• Mg => Co: Wupatkiite

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

• Cleavage: Poor on {010} (1 plane)
• Hardness: 1.5-2
• Density: 1.8

• System: Monoclinic
• Group: 2, P2
• Lattice: a=20.8, b=24.2, c=6.2, β=95.0