Collection: Vivianite

Formula: Fe²⁺₃(PO₄)₂ · 8H₂O

Colour: Colourless and transparent when fresh, quickly turning pale to deep blue, greenish-blue or bluish-green.

Luster: Vitreous, Pearly, Dull

Hardness: 1½ - 2

Specific Gravity: 2.67 - 2.69

Crystal System: Monoclinic

Member of: Vivianite Group