Vivianite Specimen

Vivianite also refereed too as the death! This is because Vivianite grows when iron and phosphate dissolved in water combine and crystalize and material like bones is high in calcium phosphate so Vivianite tends to grow on and around bones and other organic material! Most noted for its rich dark green color. It often experiences a phenomenon called twinning where two crystals grow together in symmetrical inter growth, so you can often find them in these V-like shapes where they twinned

Hardness: 1.5 – 2
Composition: Fe₃(PO₄)₂·₈H₂O