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Hexahydrite

Year of discovery: 1911 (Bonaparte river, Canada), 1963 (Japan)

Locality list: 8 localities of hexahydrite

• MgSO₄,6H₂O
• [Mg(H₂O)₆]²⁺[SO₄]^2-,6H₂O

• Class: Hexahydrite group
• Class: Sulfate - Hydrate
• Hydrate to Epsomite under humid condition.

• Mg => Fe: Ferrohexahydrite
• Mg => Ni: Nickelhexahydrite, Retgersite
• Mg => Zn: Bianchite
• Mg => Co: Moorhouseite
• Mg => Mn: Chvaleticeite

• 6H₂O => H₂O: Kieserite
• 6H₂O => 2H₂O: Sanderite
• 6H₂O => 4H₂O: Starkeyite, Cranswickite
• 6H₂O => 5H₂O: Pentahydrite
• 6H₂O => 7H₂O: Alpersite, Epsomite

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

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 2-2.5
• Density: 1.8

• System: Monoclinic
• Group: 2/m, A2/a
• Lattice: a=24.4, b=7.2, c=10.1, β=98.3