Vivianite is a hydrated iron phosphate mineral. It is a fragile mineral, occurring in the form of tabular, columnar or acicular (needle-like) crystals. Here it is embedded in a marcasite substrate.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, acicular, columnar, crystal, crystalline, crystals, dark, earth, embedded, fragile, geological, geology, hydrated, marcasite, mineral, mineralogy, monoclinic, opaque, phosphate, sciences, substrate, vivianite