dwmoar wrote:
A bit of purple color the mineral Vivianite
Vivianite is an iron phosphate mineral that has small amounts of manganese, magnesium, and calcium in its structure. Vivianite is colorless but oxidizes quickly, which means its color can change. Specimens of Vivianite can be found in shades of deep purple, dark blue, black, and green.
P25- Very interesting mineral! Sounds like an interesting characteristic. Thanks for sharing.