vivianite
noun
viv·i·an·ite
ˈvivēəˌnīt
plural -s
: a mineral Fe3(PO4)2.8H2O consisting of a hydrous ferrous phosphate that has limited isomorphism with annabergite, erythrite, and koettigite, is colorless when unaltered or blue to green when unaltered but grows darker on exposure, and occurs in monoclinic crystals or fibrous, massive, and earthy (hardness 1.5–2; specific gravity, 2.58–2.68)
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“Vivianite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vivianite. Accessed 26 Nov. 2024.
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