Gorgeous VIVIANITE thumbnail mineral specimen. See pics for size info.
Vivianite is a hydrated iron phosphate mineral, often found in blue or green shades. It's known for its unique characteristic of changing color upon exposure to light, transitioning from pale shades to darker blues, greens, and eventually purplish-black. Vivianite is commonly associated with organic material like fossils, bones, and decaying wood, and forms in various geological environments, including sedimentary deposits and pegmatites.
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