[ Top ] [ Japanese ]

Sideronatrite

Year of discovery: 1878 (San Simon mine, Chile), 2011 (Japan)

Locality list: 2 localities of sideronatrite

• Na₂Fe(SO₄)₂(OH),3H₂O
• [Na⁺₂][Fe³⁺][OH|(SO₄)₂]^5-,3H₂O

• Class: Sulfate - Hydroxide - Hydrate
• Soluble in: hot Water
• Insoluble in: Water
• Dehydrate to Metasideronatrite by low humidity or light exposure.
• Formed on hydration of Metasideronatrite.

• Na₂ => Mg: Botryogen

• 3H₂O => H₂O: Metasideronatrite

• Color: Yellow
• Streak: Pale yellow
• Luster: Vitreous

• Cleavage: Perfect on {010} (1 plane), Distinct on {100} (1 plane)
• Hardness: 1.5-2
• Density: 2.3

• System: Orthorhombic (2O, MDO1), Monoclinic (2M, MDO2) (Order-Disorder polytype)
• Group: 222, P2₁2₁2₁
• Lattice: a=7.3, b=20.5, c=7.2