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Epsomite (Photo)

Year of discovery: 1806 (Epsom, UK), 1896 (Japan)

Locality list: 31 localities of epsomite

• MgSO₄,7H₂O
• [Mg(H₂O)₆]²⁺[SO₄]^2-,H₂O

• Class: Epsomite group
• Class: Sulfate - Hydrate
• Soluble in: Water
• Insoluble in: HCl
• Magnetism: Diamagnetic
• Fluorescence: Phosphorescence (Blue)
• Dehydrate to powder under dry condition.
• Formed by hydration of Hexahydrite.

• Polymorph: Alpersite (Monoclinic)

• Mg => Mn: Mallardite
• Mg => Zn: Zincmalanterite, Goslarite (Series)
• Mg => Fe: Melanterite
• Mg => Cu: Boothite
• Mg => Co: Bieberite
• Mg => Ni: Morenosite (Series)

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

• Color: White, Colorless
• Streak: White
• Luster: Silky
• Diaphaneity: Transparent-Translucent

• Habit: Fibrous

• Cleavage: Perfect on {010} (1 plane), Distinct on {101} (2 planes)
• Hardness: 2-2.5
• Density: 1.7

• System: Orthorhombic
• Group: 222, P2₁2₁2₁
• Lattice: a=11.9, b=12.0, c=6.9