Century Dictionary and Cyclopedia
- n. In mineralogy, a hydrous phosphate of iron protoxid, occurring crystallized, also cleavable, massive, fibrous, and earthy, nearly colorless when altered, but on exposure becoming blue or green. The earthy variety, called
blue iron earthor native Prussian blue, is sometimes used as a pigment.
GNU Webster's 1913
- n. (Min.) A hydrous phosphate of iron of a blue to green color, growing darker on exposure. It occurs in monoclinic crystals, also fibrous, massive, and earthy.
- Named after its discoverer English mineralogist J. G. Vivian in 1817. (Wiktionary)
“Bone ash (made from calcining animal bones), apatite, wavellite, vivianite.”
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