Vivianite is a well-known and collectable phosphate mineral, forming very aesthetic bladed crystals often paired with a nicely contrasting matrix. Its colors are green to dark green, blue and black, and are typically translucent with a vitreous to pearly luster. It is also known to form on and within organic material such as fossilized shells.
The crystal system for Vivianite is monoclinic, typically forming flattened, elongated prismatic crystals. Other forms include radiating clusters of prismatic, acicular or fibrous crystals, tabular masses, globular aggregates and encrusting.
Quality specimens of Vivianite crystals and sprays are found in limited localities, including Bolivia, Brazil, Mexico, Ukraine and the USA (Colorado, Idaho).