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Jôkokuite, Jokokuite

Year of discovery: 1977 (Japan as the first occurence in the World)

Locality list: 2 localities of jôkokuite

MnSO₄,5H₂O

[Mn(H₂O)₄]²⁺[SO₄]^2-,H₂O

• Class: Chalcanthite group
• Class: Sulfate - Hydrate
• Soluble in: Water
• Formed on dehydration of Mallardite.
• Dehydrate to Ilesite in a month.
• Mn => Cu: Chalcanthite
• Mn => Mg: Pentahydrite
• Mn => Fe: Siderotil
• 5H₂O => H₂O: Szmikite
• 5H₂O => 4H₂O: Ilesite
• 5H₂O => 6H₂O: Chvaleticeite
• 5H₂O => 7H₂O: Mallardite
• Color: Pale pink
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent
• Habit: Fibrous
• Cleavage: No
• Hardness: 2.5
• Density: 2.0
• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=6.4, b=10.8, c=6.1, α=98.8, β=110.0, γ=75.0

Etymology: Jyokoku mine in Hokkaido island, Japan, where this mineral was discovered for the first time.