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Siderotil

Year of discovery: 1891 (Idria mine, Slovenia), 1972 (Japan)

Locality list: 7 localities of siderotil

• FeSO₄,5H₂O
• [Fe(H₂O)₄]²⁺[SO₄]^2-,H₂O

• Class: Chalcanthite group
• Class: Sulfate - Hydrate
• Soluble in: Water
• Formed on dehydration of Melanterite.

• Fe => Cu: Chalcanthite
• Fe => Mg: Pentahydrite
• Fe => Mn: Jôkokuite (Jokokuite)

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

• Color: Pale yellow, White, Pale green
• Streak: White
• Luster: Silky
• Diaphaneity: Transparent-Translucent

• Hardness: 2.5
• Density: 2.2

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=6.3, b=10.6, c=6.1, α=97.3, β=109.7, γ=75.0