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Melanterite (Photo)

Year of discovery: 1850 (World), 1875 (Japan)

Locality list: 97 localities of melanterite

• FeSO₄,7H₂O
• [Fe(H₂O)₆]²⁺[SO₄]^2-,H₂O

• Class: Melanterite group
• Class: Sulfate - Hydrate
• Variety: Pisanite (+Cu, Green)
• Soluble in: Water
• Insoluble in: HCl
• Taste: Bitter
• Dehydrate to Siderotil.
• Dehydrate to Rozenite below 21 degree under dry condition.
• Formed by hydration of Marcasite.
• Formed by hydration of Pyrite in some cases.

• Fe => Mg: Epsomite, Alpersite
• Fe => Zn: Zincmelanterite, Goslarite
• Fe => Mn: Mallardite
• Fe => Cu: Boothite
• Fe => Co: Bieberite
• Fe => Ni: Morenosite

• 7H₂O => H₂O: Szomolnokite
• 7H₂O => 4H₂O: Rozenite
• 7H₂O => 5H₂O: Siderotil
• 7H₂O => 6H₂O: Ferrohexahydrite

• Color: Colorless, Pale green
• Tarnish: Pale yellow (by hydration)
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Cleavage: Perfect on {001} (1 plane), Distinct on {110} (2 planes)
• Hardness: 2
• Density: 1.9

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=14.1, b=6.5, c=11.1, β=105.6