Colour: Colourless and ...
Lustre: Vitreous, Pearly, Dull
Hardness: 1½ - 2
Vivianite crystals are often found inside fossil shells, such as those of bivalves and gastropods, or attached to fossil bone. Pure fresh vivianite is colorless, but the mineral oxidizes very easily, changing the color, and it is usually found as deep blue to deep bluish green prismatic to flattened crystals.
From: Morococala Mine, Santa Fe Mining District, Dalence Province, Oruro Department, Bolivia
Credit: Anton Watzl