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Symplesite

Year of discovery: 1837 (Tänning, Germany), 1948 (Japan)

Locality list: 3 localities of symplesite

• Fe₃(AsO₄)₂,8H₂O
• [Fe²⁺₃][(AsO₄)₂]^6-,8H₂O

• Class: Arsenate - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄
• Oxidized to Ferrisymplesite by light exposure.

• Polymorph: Parasymplesite (Monoclinic)

• Fe => Ni: Annabergite
• Fe => Zn: Köttigite (Kottigite), Metaköttigite (Metakottigite)
• Fe => Co: Erythrite
• Fe => Mg: Hörnesite (Hornesite)
• Fe => Mn: Manganohörnesite, Manganohornesite

• Fe²⁺H => Fe³⁺O: Ferrisymplesite

• AsO₄ => PO₄: Vivianite

• Color: Pale green, Blue
• Tarnish: Greenish black (by photo-oxidation), Brown (by KOH or H₂O₂)
• Streak: Pale blue
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {1-10} (1 plane)
• Hardness: 2.5
• Density: 3.0

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.9, b=9.4, c=4.7, α=99.9, β=97.4, γ=106.0